Integrate doc updates
Added icons to provider dropdown
Allowed offers to be deleted
Made models abstract
Moved managers to their own files
Revert "Moved managers to their own files"

This reverts commit f59609c4d4255844093462febbddfbb25805c0bf.
Moved managers to the top of the file
Added update fields
Added offer and user fields to update offer
Added plan field to plan update
Added new model system
Added not requests manager
Added basic offer list view
Added links to base template
Updated edit text
Added basic edit view
Finished view for marking an offer as active / inactive
Added links to view to mark offers as active / inactive
Added view for providers to mark plans as active / inactive
Added status string to edit title