Added basic retrieval of LESS variables (as defined in various files)
Got both the load and saving of the stylesheets working
Completed Color Management page.

Updated styling of page. Updated model to ignore variable declarations that are not valid CSS colors. Also, added comments to the model to allow easier modification in the future.
Changed icon for color menu item
Updated save process to reload the files on success of all changes
Merge branch 'respond2.10' of https://github.com/madoublet/Respond2 into add_color_management_menu

Conflicts:
	modules/menu.php
Merge pull request #146 from matthewdickinson/add_color_management_menu

Add color management menu