Created initial documentation
Added update() method to RevModel. Module metadata now updates

- Also excuded built documentation folder
- Metadata notification now just shows what fields changed, not their
new values
Simplified API and updated docs. Module metadata sync now fully implemented.
Renamed Rev Base module to 'rev_base' instead of just 'base'
Added new 'schedule_operation' function to rev.modules for installing/updating

Module loader now checks for any modules set to 'auto_install' that are
not installed, and prompts the user to install them.