issue_23: display git hash of current version in the bottom toolbar. Or hide it if its not a git repo

Conflicts:
	crits/core/templates/base.html
Made display of current git hash more efficiently done.
Slight style changes. Moved git_repo_url to be a user inputted field in the control panel view
Removed seperate git hash section from bottom toolbar
Removed ISPROD. Changed link to take you to current commit. Slight style change.

Conflicts:
	crits/core/static/css/core.css
Merge remote-tracking branch 'crits/master' into release_version_pub

Conflicts:
	crits/config/forms.py
	crits/core/templates/base.html
Fixed error caused by overlooked merge conflict
Merge branch 'master' into pr/215

Conflicts:
	crits/core/static/css/core.css
Update settings.py
Adding git_repo_url to setconfig.
Don't show sources in jtable if user shouldn't see them.

Not sure when this regression occurred but this fixes it.
Fix broken campaign links in indicators.

The missing comma in the 'linked_fields' list caused anything after 'value'
and 'source' to not be handled properly.

While here, remove duplicate 'status' from fields list.

Fixes #220.
Merge branch 'master' into actor

Conflicts:
	crits/core/templates/base.html
Fixing styling issues.