Merge branch 'mapper'

* mapper: (34 commits)
  no more is_a checks on instantiation
  Path::Pattern is instantiated internally, so make the contructor require a strexp object
  Strexp#names is only used in a test, so rm
  pass the parsed path from mapper to the Strexp
  add an alternate constructor to Strexp that takes a string
  ask the strexp for the ast
  remove dead code
  disconnect path from the instance
  reuse the ast we already made
  use a parser to extract the group parts from the path
  pass the parsed parameters through the methods so we don't reparse or require caching code
  "controllers" should be a valid path name
  controllers with slash names are also not supported, so we can reuse the message
  only validate controllers
  golf down a bit
  only error handling between controller and action is the same
  add a test for controllers without colons
  move nil check to a method that yields to a block if the value is not nil
  translate action / controller to the desired object
  only one nil check on the action variable
  ...

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