[Bower] Replace BootstrapThemeEditor with Cluckles
[Views] Using Components and Editor from Cluckles
[Views] Using Cluckles templates in themeEditor.html.twig
[Config] Added theme_editor.* twig globals

Added a `theme_editor.lib_path` twig global which points to the
Cluckles build files location, to make it easier to reference the
Cluckles files from Twig Templates.

Added a `theme_editor.bootstrap_path` twig global, to make it easier to
reference the custom `bootstrap.less` file included with Cluckles in
Twig Templates.
[Dependency] Added a `bundle` BundleConfig option
[Service] Passing `bundle` option to ThemeManager service
[View] Using `theme_editor.lib_path` in editor-js
[Service] Added getCurrentThemeJsonPath to ThemeManager

This method is used to compute the web path of the `theme.json` file
that belongs to the currently active theme.
[Service] Updated bootstrap.less path in generateTheme method of ThemeManager
[Service] Now saving Css and installing theme in saveTheme method of ThemeManager

The Css is now saved if the ‘css’ key is provided with $themeData in
the saveTheme method of ThemeManager.

The css key should be provided if `Cluckles` css export option is
enabled (See https://github.com/ilikeprograms/Cluckles) for that.

This is done to avoid server side compilation of the Css which can be
problematic on shared hosting.
[Readme] Changed references to Cluckles
[Readme] Updated to reflect new API
[Changelog] Added CHANGELOG file
[Package] Updated to 0.1.0