add oauth2/oidc lib

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+CHANGELOG for 1.x
+=================
+
+This changelog references the relevant changes (bug and security fixes) done
+in 1.x minor versions.
+
+To see the files changed for a given bug, go to https://github.com/bshaffer/oauth2-server-php/issues/### where ### is the bug number
+To get the diff between two versions, go to https://github.com/bshaffer/oauth2-server-php/compare/v1.0...v1.1
+To get the diff for a specific change, go to https://github.com/bshaffer/oauth2-server-php/commit/XXX where XXX is the change hash
+
+* 1.8.0 (2015-09-18)
+
+  PR: https://github.com/bshaffer/oauth2-server-php/pull/643
+
+  * bug #594 - adds jti
+  * bug #598 - fixes lifetime configurations for JWTs
+  * bug #634 - fixes travis builds, upgrade to containers
+  * bug #586 - support for revoking tokens
+  * bug #636 - Adds FirebaseJWT bridge
+  * bug #639 - Mongo HHVM compatibility
+
+* 1.7.0 (2015-04-23)
+
+  PR: https://github.com/bshaffer/oauth2-server-php/pull/572
+
+  * bug #500 - PDO fetch mode changed from FETCH_BOTH to FETCH_ASSOC
+  * bug #508 - Case insensitive for Bearer token header name  ba716d4
+  * bug #512 - validateRedirectUri is now public
+  * bug #530 - Add PublicKeyInterface, UserClaimsInterface to Cassandra Storage
+  * bug #505 - DynamoDB storage fixes
+  * bug #556 - adds "code id_token" return type to openid connect
+  * bug #563 - Include "issuer" config key for JwtAccessToken
+  * bug #564 - Fixes JWT vulnerability
+  * bug #571 - Added unset_refresh_token_after_use option
+
+* 1.6 (2015-01-16)
+
+  PR: https://github.com/bshaffer/oauth2-server-php/pull/496
+
+  * bug 437 - renames CryptoToken to JwtAccessToken / use_crypto_tokens to use_jwt_access_tokens
+  * bug 447 - Adds a Couchbase storage implementation
+  * bug 460 - Rename JWT claims to match spec
+  * bug 470 - order does not matter for multi-valued response types
+  * bug 471 - Make validateAuthorizeRequest available for POST in addition to GET
+  * bug 475 - Adds JTI table definitiion
+  * bug 481 - better randomness for generating access tokens
+  * bug 480 - Use hash_equals() for signature verification (prevents remote timing attacks)
+  * bugs 489, 491, 498 - misc other fixes
+
+* 1.5 (2014-08-27)
+
+  PR: https://github.com/bshaffer/oauth2-server-php/pull/446
+
+  * bug #399 - Add DynamoDB Support
+  * bug #404 - renamed error name for malformed/expired tokens
+  * bug #412 - Openid connect: fixes for claims with more than one scope / Add support for the prompt parameter ('consent' and 'none')
+  * bug #411 - fixes xml output
+  * bug #413 - fixes invalid format error
+  * bug #401 - fixes code standards / whitespace
+  * bug #354 - bundles PDO SQL with the library
+  * [BC] bug #397 - refresh tokens should not be encrypted
+  * bug #423 - makes "scope" optional for refresh token storage
+
+* 1.4 (2014-06-12)
+
+  PR: https://github.com/bshaffer/oauth2-server-php/pull/392
+
+  * bug #189 Storage\PDO - allows DSN string in constructor
+  * bug #233 Bearer Tokens - allows token in request body for PUT requests
+  * bug #346 Fixes open_basedir warning
+  * bug #351 Adds OpenID Connect support
+  * bug #355 Adds php 5.6 and HHVM to travis.ci testing
+  * [BC] bug #358 Adds `getQuerystringIdentifier()` to the GrantType interface
+  * bug #363 Encryption\JWT - Allows for subclassing JWT Headers
+  * bug #349 Bearer Tokens - adds requestHasToken method for when access tokens are optional
+  * bug #301 Encryption\JWT - fixes urlSafeB64Encode(): ensures newlines are replaced as expected
+  * bug #323 ResourceController - client_id is no longer required to be returned when calling getAccessToken
+  * bug #367 Storage\PDO - adds Postgres support
+  * bug #368 Access Tokens - use mcrypt_create_iv or openssl_random_pseudo_bytes to create token string
+  * bug #376 Request - allows case insensitive headers
+  * bug #384 Storage\PDO - can pass in PDO options in constructor of PDO storage
+  * misc fixes #361, #292, #373, #374, #379, #396
+* 1.3 (2014-02-27)
+
+  PR: https://github.com/bshaffer/oauth2-server-php/pull/325
+
+  * bug #311 adds cassandra storage
+  * bug #298 fixes response code for user credentials grant type
+  * bug #318 adds 'use_crypto_tokens' config to Server class for better DX
+  * [BC] bug #320 pass client_id to getDefaultScope
+  * bug #324 better feedback when running tests
+  * bug #335 adds support for non-expiring refresh tokens
+  * bug #333 fixes Pdo storage for getClientKey
+  * bug #336 fixes Redis storage for expireAuthorizationCode
+
+* 1.2 (2014-01-03)
+
+  PR: https://github.com/bshaffer/oauth2-server-php/pull/288
+
+  * bug #285 changed response header from 200 to 401 when empty token received
+  * bug #286 adds documentation and links to spec for not including error messages when no token is supplied
+  * bug #280 ensures PHP warnings do not get thrown as a result of an invalid argument to $jwt->decode()
+  * bug #279 predis wrong number of arguments
+  * bug #277 Securing JS WebApp client secret w/ password grant type
+
+* 1.1 (2013-12-17)
+
+  PR: https://github.com/bshaffer/oauth2-server-php/pull/276
+
+  * bug #278 adds refresh token configuration to Server class
+  * bug #274 Supplying a null client_id and client_secret grants API access
+  * bug #244 [MongoStorage] More detailed implementation info
+  * bug #268 Implement jti for JWT Bearer tokens to prevent replay attacks.
+  * bug #266 Removing unused argument to getAccessTokenData
+  * bug #247 Make Bearer token type consistent
+  * bug #253 Fixing CryptoToken refresh token lifetime
+  * bug #246 refactors public key logic to be more intuitive
+  * bug #245 adds support for JSON crypto tokens
+  * bug #230 Remove unused columns in oauth_clients
+  * bug #215 makes Redis Scope Storage obey the same paradigm as PDO
+  * bug #228 removes scope group
+  * bug #227 squelches open basedir restriction error
+  * bug #223 Updated docblocks for RefreshTokenInterface.php
+  * bug #224 Adds protected properties
+  * bug #217 Implement ScopeInterface for PDO, Redis
+
+* 1.0 (2013-08-12)
+
+  * bug #203 Add redirect\_status_code config param for AuthorizeController
+  * bug #205 ensures unnecessary ? is not set when  ** bug
+  * bug #204 Fixed call to LogicException
+  * bug #202 Add explode to checkRestrictedGrant in PDO Storage
+  * bug #197 adds support for 'false' default scope  ** bug
+  * bug #192 reference errors and adds tests
+  * bug #194 makes some appropriate properties  ** bug
+  * bug #191 passes config to HttpBasic
+  * bug #190 validates client credentials before  ** bug
+  * bug #171 Fix wrong redirect following authorization step
+  * bug #187 client_id is now passed to getDefaultScope().
+  * bug #176 Require refresh_token in getRefreshToken response
+  * bug #174 make user\_id not required for refresh_token grant
+  * bug #173 Duplication in JwtBearer Grant
+  * bug #168 user\_id not required for authorization_code grant
+  * bug #133 hardens default security for user object
+  * bug #163 allows redirect\_uri on authorization_code to be NULL in docs example
+  * bug #162 adds getToken on ResourceController for convenience
+  * bug #161 fixes fatal error
+  * bug #163 Invalid redirect_uri handling
+  * bug #156 user\_id in OAuth2\_Storage_AuthorizationCodeInterface::getAuthorizationCode() response
+  * bug #157 Fix for extending access and refresh tokens
+  * bug #154 ResponseInterface: getParameter method is used in the library but not defined in the interface
+  * bug #148 Add more detail to examples in Readme.md