Reworked the templates system
Fixed coding style and documentation
Make use of namespaces

Closes #6
Reworked autoloader
Class Database\Connection transformed into Factory
Added method Database\Connection::createFromDsn()
Fixed and improved the International class
Make use of HttpFoundation in International class
Reworked the Session class
Added Resources and Entities

Moved classes:
* User -> Entity\User
* UserGroup -> Entity\UserGroup
* Localization -> Resource\Localization
Rename project and update readme
Improved and fixed Database/MySQL/Connection class
Reworked Resource and Entity classes
New exception handling mechanism
Improved settings loading
Configuration in YAML format
Locale based formatting moved to International class
Added Twig's Text extension