Merge pull request #41 from mypetyak/master

Patching a few gaps
Merge pull request #44 from mypetyak/master

Whitelisting a few non-beta views + enforcing login before Invite validation
Merge pull request #45 from mypetyak/master

Handle unauthenticated users trying to access in-beta views
Bump version to v2.0.5
Use variable for csv date format.
Remove unused import.
Remove invite_sent signal and send invitation directly.
Support custom User model.
Starting python 3.4 support.
Update travis.yml.
Exclude django 1.5.5 from python 3.4 travis test.
Remove py3 from travis config for now.
Some pep8 fixes.
User invitation.user.email or invitation.email as available.
RequestContext passed to email templates.
RequestContext passed to email templates.
Merge pull request #48 from Brendtron5000/template-changes

RequestContext passed to email templates.
Merge pull request #46 from Brendtron5000/master

Use invitation.user.email or invitation.email as available.
Updated example app Django version requirement to meet Python 3 support and match Travis test config minimum