Added a cobalt skin for cobalt cascade.

It currently only has the few icons it needs for a simple build.
Added the autolink pluggin

see https://github.com/skywickenden/ckeditor-autolink
Created a simple link plugin

It has only a title and an url. Also includes the unlink and double
click on link options from the main plugin.
Remove the text on the source area icon

The cobalt skin does not want text on the icon. Could not see a way to
edit it without changing the plugin
missing comma after class name