Basic feed posts (hides other post details)

Only shows post content
Positions feed-header
Removes jumbotron
Adds test: user#feed is sorted by score

Note: Test is not very strict.  Could be improved
Removes stale code
LinkPost has is_media field

* In Scenario#UserWithConnectionsAndFeed:
	Every 'even'  user posts a media post
Square media posts
Renames post 'content' field to 'headline'
Simplifies feed (new approach) + Fixes node-compass

Sass files needed be in public/stylesheets
Adds sidebar
Sidebar header
LinkPosts has a preview_photo_url field.

Update the preview_photo_url with LinkPost#updatePostPreviewPhotoUrl(post, callback)
Adds post#create route

If post is link_post, updates the preview_photo_url in the background
Adds topbar
LinkPost ensures http protocol on save.
User can post (dynamically knows if link_post)
Adds login link
Bold usernames
Adds post is added to author's feed as highest ranked item

* Adds config.socialSettings
Sorts feed by score lowest to highest