bootstrap Propel support
update to 2.0 branch of SonataAdminBundle
add Number- and StringFilter
add basic CRUD to ModelManager
re-factor Filter, add CriteriaMap for comparison
add support for basic batchDelete
remove metadata related methods
convert doc to rST format
add type detection to ModelManager

* add ModelFilter
* add synonyms for filter
add handling of "Propel" sub-namespace for routes

This sub-namespace is used by several bundles to separate the implementation
of its model classes from the specific Propel model implementations.
Added composer json file
Fixed interface requirments
Fixed form factory parameter order
Fixed batch action in case of deleteAll
Merge pull request #3 from ClementGautier/develop

Updated the bundle to work with current dependencies