snf-django-lib: Fault Exceptions now have code attr
PEP8 styling fixes in faults.py
Move parsedate module to snf_django
Move cloud faults to 'snf_django.lib.api.faults'
Gather all faults from all synnefo projects into common'snf_django.lib.api.faults'.
Implement single decorator for handling API calls
Create a single decorator for API methods to be used be accross allsynnefo. This decorator does the following: