custom user models for applications to use
Merge branch 'master' into misc_fixes
Merged in misc_fixes (pull request #8)

custom user models
added helper forms
sphinx docs
backend and models docs
forms docs
docs command
README updated
application specific behaviour like admin groups should be in application, not backend
Merged in misc_fixes (pull request #10)

application specific behaviour like admin groups should be in application, not backend
user stormpath error message
Merge branch 'master' into misc_fixes
replaced deprecated error.message syntax with str(e)
code standards improvements
minor pep8 fix
don't raise ValidationError, just set the form error
Merged in misc_fixes (pull request #11)

user stormpath error message and pep8 fixes