Updated to work with latest symposion code

[mjumbewu]

Various changes to get the pinax-project-symposion template working with the latest code in the symposion repo. Addresses issues #18 and #19 at least.

[oorestisime]

Hello,

thanks for this PR, it helped by advance a bit with the boxes and cms error. I now although get

Traceback (most recent call last):
  File "manage.py", line 12, in <module>
    execute_from_command_line(sys.argv)
  File "/home/grok/testing/symposion-env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 351, in execute_from_command_line
    utility.execute()
  File "/home/grok/testing/symposion-env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 325, in execute
    django.setup()
  File "/home/grok/testing/symposion-env/local/lib/python2.7/site-packages/django/__init__.py", line 18, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/grok/testing/symposion-env/local/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate
    app_config.import_models(all_models)
  File "/home/grok/testing/symposion-env/local/lib/python2.7/site-packages/django/apps/config.py", line 198, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/home/grok/testing/symposion-env/local/lib/python2.7/site-packages/symposion/proposals/models.py", line 176, in <module>
    reversion.register(ProposalBase)
AttributeError: 'module' object has no attribute 'register'

Its probably a long time you did this PR, i just felt to report this.