adding activities migration and model
adding activities migration
Adding activities, tests, API, backend, and everything
增加移动版Header和样式表
Minor fixes

* add discourse to sudo
* add `bundle exec` on some calls
* inform user of NUM_WEB/sockets count for nginx config
Adding activities
Adding subcategories
Adding un-sub-categorized site setting.
Adding un-sub-categorized site setting.
Adding un-sub-categorized site setting.
No sudo perm for user

Also changed order on informing user that he'll be encountering errors that needs admin access before calling `rvm`.
suggested BBS copy change for inappropriate flag
fix amazon onebox to pull images again
FIX: Amazon spec
Fixes #1496 - Ember 1.0 regression
User expansion loading improvements
Better unloading of Poster expansion
Changes to user expansion
Make date on User expansion gray
minor copyedit to reduce repetition on dialog