[PD-767] Used SFM widget for seo sites.
Implemented Ashley's suggestions.
Removed init method as it didn't seem to be doing anything productive.
I *think* I fixed job source ids
Removed lazy option as it's redundant.
Moved to lazy loading
updated searchable fields and lazily load widgets.
moved job source ids stuff to company form as not everything that inherits from seositereverse needs it.
modified initial data.
Rolled back to using the slow widget for the moment.
Switched back to fsm. Just need to find out how to pass in selected at instantiation.
Allow initial sites to load correctly
Commited discrepancy between how our FSM widget works compared to the built-in django one.
Explain why I reintroduce a custom init.
Merge pull request #1048 from DirectEmployers/pd-767

[PD-767] Admin Speed Improvements