Move and rename system tests

* Move system tests back into Action Pack
* Rename `ActionSystemTest` to `ActionDispatch::SystemTestCase`
* Remove private base module and only make file for public
`SystemTestCase` class, name private module `SystemTesting`
* Rename `ActionSystemTestCase` to `ApplicationSystemTestCase`
* Update corresponding documentation and guides
* Delete old `ActionSystemTest` files

1 files changed, 0 insertions, 1 deletions

diff --git a/ci/travis.rb b/ci/travis.rb
index 2958b5b0f5..f59ce5406a 100755
--- a/ci/travis.rb
+++ b/ci/travis.rb
@@ -24,7 +24,6 @@ class Build
     "av"       => "actionview",
     "aj"       => "activejob",
     "ac"       => "actioncable",
-    "ast"      => "actionsystemtest",
     "guides"   => "guides"
   }