Project landing template

contributors @christophermlne, @tochman

Notes
- extensively reworked and refactored project landing page
- new field for marketing content (pitch:text)
  - still needs to be connected to the mercury editor
- styling fixes
- new project actions drop-down UI element
- new join project button
- new project sidebar with widgets
- moved first 5 members to project sidebar
  - this is setting us up to expose project leadership roles in sidebar as per the lofi
  - full project members list available in modal overlay

User Story: https://www.pivotaltracker.com/story/show/77280446
Lofi: https://docs.google.com/file/d/0B9FqKjpP8_MUMnRVQ2VfNkVzUGs/edit
Heroku instance: http://enigmatic-lake-8055.herokuapp.com/projects/websiteone
(log in as random@random.com | randomrandom)