Turn system testing into it's own gem and rename

Renames `Rails::SystemTestCase` to `ActionSystemTest` and moves it to a
gem under the Rails name.

We need to name the class `ActionSystemTestCase` because the gem expects
a module but tests themselves expect a class.

Adds MIT-LICENSE, CHANGELOG, and README for the future.

1 files changed, 1 insertions, 1 deletions

diff --git a/ci/travis.rb b/ci/travis.rb
index c49a87d864..2958b5b0f5 100755
--- a/ci/travis.rb
+++ b/ci/travis.rb
@@ -24,6 +24,7 @@ class Build
     "av"       => "actionview",
     "aj"       => "activejob",
     "ac"       => "actioncable",
+    "ast"      => "actionsystemtest",
     "guides"   => "guides"
   }
 
@@ -154,7 +155,6 @@ ENV["GEM"].split(",").each do |gem|
 
     build = Build.new(gem, isolated: isolated)
     results[build.key] = build.run!
-
   end
 end