Fix audience_level validation guards on Proposal
Remove custom index names from migrations
Add indices when creating proposals-users join table
Snippets need a unique index on their slugs
Fix image paths in custom.css.sass
Remove body padding from custom.css.scss
Fix a few instances of overzealous HTML escaping

Mostly in Ignite-mode views
Use :ocw_default to format proposal submission times
Rework display of speaker information without user_profiles on
Add namespace to model classes mentioned in views
Fix OpenConferenceWare.mounted_path to handle paths starting with "/"
Update generated initializer to assign audience levels
Add a feature flag for user favorites
Improve handling of OmniAuth failures
Add the mailer_host option to generated config