Refactored error handling

* Added py.test options to unit tests
* Added check for weak passwords
* Added check for signature
* Changed error handling
Removed bottle neck
Removed check
Version 0.2.12
* Added password requirements comment
* Changed comment style for server
* Changed server object creation
* Reduced use of metadata
Changed comment style and email address
Added deny to user creation
Changed server config sample
Updated README.md