Update overall UI and Change Routing

The UI received a full overall for easier theming and a better flow. A new logo was introduced for OpenCFP.

The routing switched to named routes and also has a feature for secure SSL routes if activated via config.

The original seed/schema SQL file was recreated into a phinx migration, so now all DB creation/migrations are run through phinx.

Added twig markdown extension for use with large textarea fields like bio, talk description, and other info fields.

Dummy (filler photo) has been moved out of the uploads folder, since uploads folder should only contain user generated content, not defaults.