Python 3 support

[ScenK]

We decided to support python (3.3+). Here are the tasks for supporting python3.

This is a working copy...

• basic py3 grammer
• flask_login
• fabric - use Fabric3 forked version
• mongoengine
• email utils
• supervisor
• ...

[ScenK]

Seems this issue will be a long term... Some of the dependancies are out of date and out of maintenance. Another words i would like to consider more about how further the project will go.