Sets up paper_trail tracking in important models
and add conference_id to versions for storing conference_id
of conference related objects as metadata.This will help in querying
for versions related to conferences.
Fix issues with factories & event types initialization.Import paper_trail testing helpers
Fix bug: Creating an event creates a useless version with event update
Add revert and view changes features to revision history
If footer is set to a fixed height, it makes some white block
between footer and bottom of page.
Its height should be resized according to footer content.
Related to #840
Signed-off-by: Carlos Coelho <carlos@pencillabs.com>
* Cleanup the CSS
* Fix more views then you have fingers and toes
* Introduce position(weight) for sponsor levels
* Fix bootstrap/datatable integration
