Merges ActivityManager into Post Model
Fixes Redis/MongoDB mismatches

NOTE: Use "npm test" to ensure Redis uses test port

MongoDB was cleaned before every test but Redis wasn't.
Thus, operations using Redis-provided ids were failing to
find the matching objects in MongoDB.
Post#findByIds WITH_LAST_RELAYER
Filter out user.password attribute on json responses

Applies to post.last_relayer too

* Adds User.findByIdJSON()
AngularJS can fetch popular places.

Able to receive correct data from server.  No UI functionality yet.

* Allows AngularJS Partials in views/partials.
* Adds Bootstrap to main sass file.
* Bower directory set to public/lib (gitignored).