Revert back to django-cms name and suffix version with pbs

There are problems with dependencies if we change the name of the
project. E.g. we can't force other project not to pull original project
because of their dependencies => we need to rely on versioning alone to
force all packages to use our fork.

* Dev mode: in the umbrella project specify the development dependency as
'<x.y.z' where x.y.z is the next version unreleased of the parent prj
* Stable mode: in the umbrella project keep 2 dependencies for our fork.
'<x.y.z' and '==x.y.zpbs'