Solving problem concerning caching of sent requests
Caching problem not solved with the last commit. This should work.
There was a 'self.' missing
Updated the sent_requests cache when a user accepts a friendship request so that the request disappears from the list of sent requests
Updated the sent_requests cache when a user rejects a friendship request so that the request disappears from the list of sent requests
Revert "Updated the sent_requests cache when a user accepts a friendship request so that the request disappears from the list of sent requests"

This reverts commit e6a47f557ab89bd31bcfc5aea84ab3695d945631.
Revert "Revert "Updated the sent_requests cache when a user accepts a friendship request so that the request disappears from the list of sent requests""

This reverts commit 71818efd1081235460a7c0e5b98cc18d706c76f3.
Removing last modification: no need for reject
Solving DeprecationWarning in Django 1.6 // Django 1.7 compatibility
Put my TravisCI status instead of revsys
Merge branch 'master' into friendship_requests_security_fix