Reduced complexity and make usage easier

[sstok]

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	yes
Deprecations?	no
Tests pass?	yes
Fixed tickets
License	MIT

• The Configurator and Validator are now combined.
• Host no longer allows the usage of regexp (only |)
• Prefix now explicitly disallows usage of attributes (this wasn’t supported but now it’s forbidden)
• Section can only be registered at single point. Late resolving had to many issues
• Sections must be configured in the AppKernel (to ensure there parameters are registered prior to any extension)

The package is changed from a Symfony Bundle to a library, registering the routes loader is handled by the SectioningFactory.