Basic structure for following users working.

Not optimal code. Needs reviewing...

Main stuff done:
- Created follow app for follow feature
- Basic model created with constraints of uniqueness
- Follow and Unfollow button implemented
- Showing followers and following users on profile
- Added sass stylesheet
Merge branch 'master' into nuno

Conflicts:
	accounts/urls.py
	accounts/views.py
	media/css/all.css
	settings.py

Also:
- fixed double dependency of pil in requirements.txt
- a random merging error in accounts/views.py
Improving small follow features design issues

- Now showing following and followers users in home page too (not only
  on the profile page)
- Info on the left and collapsed only in one section
- Avatar position in home page fixed
- Using avatars instead of user links for following and followers

- Now working on home page too (not only on the profile page)e)
Merge branch 'master' into nuno
Putting follow urls in the correct place
Following queries added and urls improved.

Also renamed FollowingTagItem to FollowingQueryItem.
Following users and groups of tags with AJAX.
Merge branch 'master' into nuno
Following Tag Group concept finally clear and implement
Fixing previous commit.
Small css fix in tag group
Still fixing following tags and related stuff

- Refreshing page after following/unfollowing user
- Removing individual links from tag in tag groups following
- CSS fixes in tag groups
- Change wording for browse tags page with no sounds
- Social section no detects if current user or other for better wording
First version of "stream" page
Fixing Social section in home page
Most used tags social on top of social section.
Specific dates option for stream page working
Removing debug messages from previous commit
Seperating stream updates into two sections, users and tags.
Implemented django command to send plain text stream emails
Merge branch 'master' into nuno after commiting stream plain text stuff