Added cucumber feature that verifies utf-8 compatibility in source files

(as a reaction to #71)

features/unicode_compatiblity.feature

@@ -0,0 +1,67 @@
+@test_unit @unicode
+Feature:
+
+  Files with unicode in their source should be no problem at all for
+  generating a proper coverage report.
+
+  Background:
+    Given SimpleCov for Test/Unit is configured with:
+      """
+      require 'simplecov'
+      SimpleCov.start 'test_frameworks'
+      """
+
+  Scenario: Snowman inside method string
+    Given a file named "lib/faked_project/unicode.rb" with:
+      """
+      # encoding: UTF-8
+      class SourceCodeWithUnicode
+        def self.yell!
+          puts "☃"
+        end
+      end
+      """
+
+    When I open the coverage report generated with `bundle exec rake test`
+    Then I should see the groups:
+      | name      | coverage | files |
+      | All Files | 86.67%   | 5     |
+
+    And I should see the source files:
+      | name                                    | coverage |
+      | lib/faked_project.rb                    | 100.0 %  |
+      | lib/faked_project/some_class.rb         | 80.0 %   |
+      | lib/faked_project/framework_specific.rb | 75.0 %   |
+      | lib/faked_project/meta_magic.rb         | 100.0 %  |
+      | lib/faked_project/unicode.rb            | 66.67 %  |
+
+    And the report should be based upon:
+      | Unit Tests |
+
+  Scenario: Author name in comment
+    Given a file named "lib/faked_project/unicode.rb" with:
+      """
+      # encoding: UTF-8
+      # author:  Javiér Hernández
+      class SomeClassWrittenByAForeigner
+        def self.yell!
+          foo
+        end
+      end
+      """
+
+    When I open the coverage report generated with `bundle exec rake test`
+    Then I should see the groups:
+      | name      | coverage | files |
+      | All Files | 86.67%   | 5     |
+
+    And I should see the source files:
+      | name                                    | coverage |
+      | lib/faked_project.rb                    | 100.0 %  |
+      | lib/faked_project/some_class.rb         | 80.0 %   |
+      | lib/faked_project/framework_specific.rb | 75.0 %   |
+      | lib/faked_project/meta_magic.rb         | 100.0 %  |
+      | lib/faked_project/unicode.rb            | 66.67 %  |
+
+    And the report should be based upon:
+      | Unit Tests |