Adds command guessing support for Rails 4 functional tests

Rails 4 issues the command
    rake_test_loader.rb test/{controllers,mailers,functional}/**/*_test.rb
to run functional tests. This adds a second clause to the case statement
to properly guess that these are functional tests.

Adds tests for each of the basic kinds of tests Rails 4 runs.

CHANGELOG.md

@@ -1,6 +1,8 @@
 Unreleased ([changes](https://github.com/colszowka/simplecov/compare/v0.7.0...master))
 -------------------
 
+  * [FEATURE] Adds support for Rails 4 command guessing.
+
 v0.7.1, 2012-10-12 ([changes](https://github.com/colszowka/simplecov/compare/v0.7.0...v0.7.1))
 -------------------
 
@@ -170,4 +172,4 @@ v0.5.0, 2011-09-09 ([changes](https://github.com/colszowka/simplecov/compare/v0.
   * The display of source files has been improved a lot. Weird scrolling trouble, out-of-scope line hit counts
     and such should be a thing of the past. Also, it is prettier now.
   * Source files are now syntax highlighted
-  * File paths no longer have that annoying './' in front of them
+  * File paths no longer have that annoying './' in front of them

lib/simplecov/command_guesser.rb

@@ -18,7 +18,7 @@ def guess
 
     def from_command_line_options
       case original_run_command
-        when /#{'test/functional/'}/
+        when /#{'test/functional/'}/, /#{'test/{.*?functional.*?}/'}/
           "Functional Tests"
         when /#{'test/integration/'}/
           "Integration Tests"

test/test_command_guesser.rb

@@ -11,9 +11,9 @@ def self.should_guess_command_name(expectation, *argv)
       end
     end
 
-    should_guess_command_name "Unit Tests", '/some/path/test/units/foo_bar_test.rb', 'test/units/foo.rb', 'test/foo.rb'
-    should_guess_command_name "Functional Tests", '/some/path/test/functional/foo_bar_controller_test.rb'
-    should_guess_command_name "Integration Tests", '/some/path/test/integration/foo_bar_controller_test.rb'
+    should_guess_command_name "Unit Tests", '/some/path/test/units/foo_bar_test.rb', 'test/units/foo.rb', 'test/foo.rb', 'test/{models,helpers,unit}/**/*_test.rb'
+    should_guess_command_name "Functional Tests", '/some/path/test/functional/foo_bar_controller_test.rb', 'test/{controllers,mailers,functional}/**/*_test.rb'
+    should_guess_command_name "Integration Tests", '/some/path/test/integration/foo_bar_controller_test.rb', 'test/integration/**/*_test.rb'
     should_guess_command_name "Cucumber Features", 'features', 'cucumber', 'cucumber features'
     should_guess_command_name "RSpec", '/some/path/spec/foo.rb'
     should_guess_command_name "Unit Tests", 'some_arbitrary_command with arguments' # Because Test::Unit const is defined!