Fixed an issue where saving a content block from one region_manager screen will disable active_content blocks from other pages.

Moving from a direct dependency on nodeblock for creating blocks to a hook driven API for adding create links.  Nodeblock is still supported.

Bug Fix: Theme regions were deleted after disabling a theme and resaving the 'Region manager regions' form.

Move the nodeblock create above the active_path table, and fix a bug where the nodeblock create was displaying twice.

Move the nodeblock create above the active_path table, and fix a bug where the nodeblock create was displaying twice.

Bug fix by sprocketjared: region_manager_regions_load_all() runs unserialize on the whole record being loaded, instead of 'modules'.

caching
Bug Fixes:
Blocks moved to active where 'pages' is empty are now disabled.
Removed the check to see if the block was visible on a page before executing the preg_replace() that removed the page from 'pages'.

Renamed nodeblocks, and added a row class to each row for the appropriate region in the manage form.

Made some performance changes and fixed a bug where nodeblocks weren't displaying on the admin settings page.