Merge pull request #14 from baasbox/master

update from origin
Improvement of the Follow APIs

The POST /follower API now returns the profile of the followee
Added new API GET /user/:username to obtain an username profile.
The data returned depending by the Role of the caller user
added route for new API GET /user/:username
Merge pull request #174 from giastfader/master

Improvement of the Follow APIs and New GET /user/:username API