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_distribution.rb

@@ -0,0 +1,66 @@
+class JasmineDev < Thor
+
+  desc "build_distribution", "Build Jasmine js & css files"
+  def build_distribution(directory = "./lib/jasmine-core")
+    invoke :js_hint
+
+    say JasmineDev.spacer
+
+    say "Building Jasmine distribution from source into #{directory}", :cyan
+
+    say 'Building JavaScript...', :yellow
+
+    inside directory do
+      create_file "jasmine.js",
+                  concat_contents_of(jasmine_js_paths),
+                  :force => true
+      create_file "jasmine-html.js",
+                  concat_contents_of(jasmine_html_js_paths),
+                  :force => true
+    end
+
+    say 'Building CSS...', :yellow
+
+    run "compass compile", :capture => true
+
+    copy_file File.join("#{JasmineDev.project_root}", 'src', 'html', 'jasmine.css'),
+              File.join(directory, 'jasmine.css')
+  end
+
+  no_tasks do
+    def jasmine_js_paths
+      sources_list = File.read(File.join(JasmineDev.project_root, 'src', 'SourcesList.json'))
+      first_paths = JSON.parse(sources_list).collect do |f|
+        File.join(JasmineDev.project_root, 'src', 'core', f)
+      end
+
+      remaining_paths = Dir.glob(File.join(JasmineDev.project_root, 'src', 'core', '*.js'))
+      remaining_paths << File.join(JasmineDev.project_root, 'src', 'version.js')
+
+      add_only_new_elements(first_paths, remaining_paths)
+    end
+
+    def jasmine_html_js_paths
+      first_paths = []
+      first_paths << File.join(JasmineDev.project_root, 'src', 'html', 'HtmlReporterHelpers.js')
+      first_paths += Dir.glob(File.join('.', 'src', 'html', '*.js'))
+
+      remaining_paths = Dir.glob(File.join(JasmineDev.project_root, 'src', 'html', '*.js'))
+      add_only_new_elements(first_paths, remaining_paths)
+    end
+
+    def add_only_new_elements(first, remaining)
+      remaining.inject(first) do |result, element|
+        result << element unless result.include?(element)
+        result
+      end
+    end
+
+    def concat_contents_of(paths)
+      paths.inject("") do |string, path|
+        string << File.read(path)
+        string
+      end
+    end
+  end
+end