moved JavaScript code out of TinymceHelper. now keeps RTE related code in `Croogo.Wysiwyg`.
the Wysiwyg plugin.
moved fields configuration to Wysiwyg plugin.
dependencies loaded first.

There could be scenarios where Tinymce appears before Wysiwyg in Hook.bootstraps. But Wysiwyg is a dependency plugin of Tinymce. In that case we need to reorder the list of plugins to be loaded.

This could become a part of a lib in the future or done in Extensions plugin whenever a plugin is activated/deactivated.
Wysiwyg plugin is enabled by default.
Merge branch '1.5' of github.com:croogo/croogo into 1.5
README updated.
adding cast to prevent undefined errors
upgrade: insert/move Wysiwyg before Tinymce