Working on refactoring load_router.php, creating the ModuleLoader class.
Started working on ModuleLoader. Also made a lot of changes needed to start working on the permission system, specifically: allowing/denying a Venue's access to individual Modules.
Fixed up Installation a little bit:

* Taking advantage of PureCSS's 'required' form field attribute
* Removed the 'Venue Label' field from the 'Venue Info' form so we can use the default 'Main' Venue Label. This resolved Issue #54.