Re-implemented all development Rake tasks in Thor. Now actually tested.

Fixes:
* https://www.pivotaltracker.com/story/show/25484287 & https://github.com/pivotal/jasmine/issues/183
* https://www.pivotaltracker.com/story/show/25485401 & https://github.com/pivotal/jasmine/issues/189
* https://www.pivotaltracker.com/story/show/25485953 & https://github.com/pivotal/jasmine/issues/159

tasks/jasmine_dev/build_standalone_runner.rb

@@ -0,0 +1,59 @@
+class JasmineDev < Thor
+  include Thor::Actions
+
+  desc "build_standalone_runner", "Build HTML spec runner for Jasmine standalone distribution"
+
+  def build_standalone_runner
+    say JasmineDev.spacer
+
+    say "Building standalone runner HTML...", :cyan
+
+    create_file File.join(standalone_temp_dir, 'SpecRunner.html') do
+      template = Tilt.new(File.join('spec', 'templates','runner.html.erb'))
+
+      scope = OpenStruct.new(:title => "Jasmine Spec Runner",
+                             :favicon => example_favicon,
+                             :jasmine_tags => example_jasmine_tags,
+                             :source_tags => example_source_tags,
+                             :spec_file_tags => example_spec_tags)
+      template.render(scope)
+    end
+  end
+
+  no_tasks do
+    def standalone_temp_dir
+      @standalone_temp_dir ||= File.join(Dir.tmpdir, 'jasmine_standalone', "jasmine-standalone-#{version_string}")
+    end
+
+    def example_path
+      File.join('lib', "jasmine-#{version_string}")
+    end
+
+    def example_favicon
+     %Q{<link rel="shortcut icon" type="image/png" href="#{example_path}/jasmine_favicon.png">}
+    end
+
+    def script_tags_for(files)
+      srcs = (files.is_a?(String) ? [files] : files)
+      srcs.inject([]) do |tags, file|
+        tags << %Q{<script type="text/javascript" src="#{file}"></script>}
+        tags
+      end.join("\n  ")
+    end
+
+    def example_jasmine_tags
+      tags = %Q{<link rel="stylesheet" type="text/css" href="#{example_path}/jasmine.css">}
+      tags << "\n  "
+      tags << script_tags_for(["#{example_path}/jasmine.js", "#{example_path}/jasmine-html.js"])
+      tags
+    end
+
+    def example_source_tags
+      script_tags_for ['spec/SpecHelper.js', 'spec/PlayerSpec.js']
+    end
+
+    def example_spec_tags
+      script_tags_for ['src/Player.js', 'src/Song.js']
+    end
+  end
+end