Change UserFactory to create vouched users by default.

Since the most common test scenario requires vouched users to work, I
switched UserFactory to vouch users by default. Also added parameter
'vouched' to easily explicitly control the vouch status.
Don't need to force ElasticSearch update after UserFactory.create().
[bug 978694] Tests for GraphiteMixin.

This wasn't added to the original commit, too many untracked files.
Merge pull request #888 from glogiotatidis/978694

[bug 978694] Tests for GraphiteMixin.
Merge pull request #871 from glogiotatidis/testscleanup

Clean up testcases
Cleanup templates.
Merge pull request #900 from glogiotatidis/templates

Cleanup templates.
[fix bug 990538] Beautify and cleanup group urls.