Fixed security bug on users info
Fix small test fails introduced in the commit 27f12f7
Fix problem on user deletion
[backport] Fix wrong handing integrity error on register or accept invitation.
[backport] Fix wrong handling patch request with user_stories list on milestone resource. (fix #1163)
[backport] Fix possible race condition on register using select for update.
Improving feedback when registering users
Fix bug #60 on github: Emojis urls problem
[backport] Fix unexpected exception when delete task with deleted milestone.
[backport] Making the project name not mandatory and using the owner username for the slug generation
[backport] Normalize final attachment filename.
Remove unnecesary file
Merge branch 'master' into stable

Conflicts:
	requirements.txt
Fix issue #1249: Wiki link to deleted reference problem
Removing duplicated Unidecode
Removing duplicated enum requirement
Bug #1247: Add a link to attachment (added or modified) in emails