Merge pull request #88 from sunshinephp/master

Usability updates.
Merge pull request #89 from sunshinephp/master

Added Admin capabilities to manage admins, and other minor fixes.
Allow enabling twig debug mode from config file
Checking is defined and specifying defaults
When in debug mode allow silex to print the error messages
Merge pull request #91 from sunshinephp/master

OpenCFP will now recognize enddate.
Merge pull request #93 from andrewshell/fixing-strict-twig-errors

Checking is defined and specifying defaults
Merge pull request #92 from andrewshell/support-twig-debug

Allow enabling twig debug mode from config file
Merge pull request #94 from sunshinephp/master

Cleaned up some failing tests, and reorganized to help with testing.