Added a way to reverse check for system scope permissions
Upgraded the manage app controller to use the permission check component
Fixed a schedule entry issues related to DST
Fixed an issue in the calender which occurred when Google Tag Manager wasn't defined
Added a back button to the manage plugin's layout
Updated the translations
Translated using Weblate (Dutch (ISO 639-2))

Currently translated at 94.7% (143 of 151 strings)
Fixed #165 and added auto positioning on popover.
Translated using Weblate (Dutch (ISO 639-2))

Currently translated at 94.7% (143 of 151 strings)
Merge remote-tracking branch 'origin/develop' into develop
Fix the school and language model
Google Tag Manager now only gets added when not in debug mode
Improved the navigation on the manage main page
Moved the author and gravatar to a pull-right on the post view
Created a basic email configuration
Created a basic implementation for organization management
Created links to the organization management controller
Added a isset check to the IP check in the core config file
Added .gitreview file for Gerrit

Change-Id: If623bdef5d9adb6240b0cfaa3c6892e31c04e798
Added a isset check to the IP check in the core config file