Remove sub-users module from admin sidebar
Fix minor issue where GSD config wouldn't show http(s)
Fixes issue where invalid JSON data was being sent to GSD

closes #277
Installer updated to make it easier to follow
Clarify text on installer
Update 0.7.5 documentation
Update to Klein 2.1.x
Update stats page, and check server status for header every 15 seconds
Update to correct folder permissions
Chmod check update
Update hash.php
Update upgrading.rst
Update 0.7.4 updater file
Update 0.7.4.1-beta.php