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.
Merge pull request #885 from glogiotatidis/niceurls

[fix bug 990538] Beautify and cleanup group urls.
[Fix bug 703316] Update invite email
[bug 842490] Restore TextArea DOM element for message.
Merge pull request #898 from jpotts/fix_703316

[Fix bug 703316] Update invite email
[fix bug 995950] Remove old images and scripts.
[Fix bug 694410] Add story link to profile
Merge pull request #897 from jpotts/fix_694410

[Fix bug 694410] Add story link to profile
[fix bug 970697] Display websites in central column.
Merge pull request #902 from glogiotatidis/970697

[fix bug 970697] Display websites in central column.
[bug 997080] Update tabzilla URLs.
[bug 997080] Add .htaccess for media caching.
[bug 926687] Delete group.languages contenttype and permissions.