Add validation on comment status
Update installation.rst

Installing the bundle I got 
  The service "sonata.classification.api.form.type.category" has a dependency on a non-existent service "jms_serializer.metadata_factory".

The library was present but not loaded on AppKernel.
Adding it solved the problem...
Add validation on post content formatter
Add validation on post slug
Make comment status validation easier
Prevent unsetting of post publication start date on update
Merge pull request #205 from Wharenn/publication_data_reset_fix

Prevent unsetting of post publication start date on update
Merge pull request #204 from Wharenn/api_parameters_validation

Api parameters validation
Merge pull request #202 from mmf-amarcos/patch-1

Missing jmsserializer instance on appkerner. Update installation.rst
Merge remote-tracking branch 'sonata-project/master'