Description of problem:
RabbitVCS doesn't work out of the box.

Version-Release number of selected component (if applicable):
rabbitvcs-nautilus-0.16-3.fc21.x86_64
rabbitvcs-gedit-0.16-3.fc21.x86_64
rabbitvcs-core-0.16-3.fc21.noarch
rabbitvcs-cli-0.16-3.fc21.noarch

How reproducible:
Always

Steps to Reproduce:
1. nautilus

Actual results:
$ nautilus
Traceback (most recent call last):
  File "/usr/share/nautilus-python/extensions/RabbitVCS.py", line 79, in <module>
    import rabbitvcs.ui.property_page
  File "/usr/lib/python2.7/site-packages/rabbitvcs/ui/property_page.py", line 40, in <module>
    from rabbitvcs.services.checkerservice import StatusCheckerStub as StatusChecker
  File "/usr/lib/python2.7/site-packages/rabbitvcs/services/checkerservice.py", line 48, in <module>
    import simplejson
ImportError: No module named simplejson

Expected results:
RabbitVCS loaded

Additional info:
Please, add a dependency to python-simplejson