Setup virtualenv to own folder for easy removal and changing.

Virtualenv now defaults to 'venv' instead of '.'

Refs #12273
Fix fabfile bug related to GIT_INSTALL checkout

django_object_log and django_object_permissions were getting checked out
from git even though they were listed in requirements.txt. This is due
to their names containing underscores and not dashes in GIT_INSTALL, and
they way their existence was checked for in install_dependencies_git()

Refs #12273
Ignore 'env' or 'venv' virtualenv directories.

Refs #12273
Create DEV and PROD constants for better reference.

We had a lot of strings of 'development' and 'production', which I
replaced with the constants DEV and PROD.

Refs #12273
Mark Templatetags and minor Refactor overview.py
Split requirements out to prod and dev.

Updated the fabfile to reflect that requirements.txt is now
requirements/prod.txt.

Refs #12273
Remove Errors on Overview Page

This removes the "errors" context variable in the overview view, the
tests aginst that variable, and the section of the overview template
that would include the sub template to render the errors.

Refs #11673
Fix GWM at Django 1.4

Django 1.5 added more strict requirements for STATIC_URL. Since our
settings doesn't currently end in a slash, the project fails to test or
run.

Refs #12801
Merge branch 'bug/11673' of git.osuosl.org:ganeti/ganeti_webmgr into develop
Merge branch 'develop' of git.osuosl.org:ganeti/ganeti_webmgr into develop
Freeze django-object-permissions at 1.4.5

This fixes the problem of missing templates for object_permissions.

Refs #12273
Default deployment to production.

Only need to run fab deploy now, not 'fab prod deploy'

Refs #12273
Update documentation on activating virtualenv

Refs #12273
Update 'fab prod deploy' documentation references

Refs #12273
cluster_qs_for_user: Add kwargs groups and readonly

Now checks group permissions and includes readonly clusters by default. This
can be overridden using the new kwargs.

refs #12981
Add tests for cluster_qs_for_user

refs #12981
Merge branch 'develop' of git.osuosl.org:ganeti/ganeti_webmgr into develop
pep8'd all files in ganeti_web
refs #13287
pep8's all in ganeti_webmgr
refs #13287
pep8'd all in ganeti_web/backend
refs #13287