Merge pull request #163 from thecourseforum/more-fixups

More fixups

- Howto modal for scheduler

- Various button/ui fixes for scheduler
- Cleaned up sidebar views
- Changed global modal header styles

Release for version 3.0

- redesign
- renovated course show, browse
- scheduler beta

Mailer update

Version 2.1 stable

Version 2.1 stable

Version 2.0 stable

Version 2.0 Stable