Fix #22: pass parameters to ParamProvider via ezpublish.yml

[lolautruche]

This patch makes it possible to pass settings to view providers, easing reusability. One can for instance more easily use configurable query types.

TODO:

• [x] Implementation
• [x] Documentation
• [x] Add more tests

Follow-up for 2.0: #32 (change ViewParameterProviderInterface::getParameters() signature).

[flovntp]

+1