#1452610 - Adding check for libraries_load() and creating error message if not found. Adding note of requirement of 7.x-2x. branch of Libraries API to README

theme_get_setting now uses default theme as second param.

decouple form callback and grid generation.  new function that lists all responsive related settings.

rename fusion_labels.css to fusion-labels.css for consistency with other fusion stylesheets.  added font family and size to css to avoid be affected by theme styling.

loop through all layouts to generate options, rather than hard code them.  css added to support label for currently selected grid.

consolidated parameters for most functions to use a single $options, which is easier to pass from one to the other as a small data object.  added generation for grid color overrides.  special formatting for mobile layouts.