Bottle-cork

* Flask import bugfix. Closes: 79

* Add Flask support
* MongoDB: add authentication 68
* Enable configurable SMTP port. Closes: 43
* Remove unneeded setuptools dependency. Closes: 40

* Decorator support added. 6
* 'last_login' user attribute added. 47 48
* In-memory SQLite Database support added.
* CONTRIBUTORS.txt added
* Bugfix: configurable role table name 46
* Bugfix: email address 42

* SQLite support added.
* SMTP URL bugfix 38

* scrypt implemented, bugfixes 34 35 32

* Configurable backend support added.
* SQLAlchemy and MongoDB support added.
* Closes: 8 27 28