Heroku upload

Updates:
- Updated app to handle each environment variable on Heroku as a single variable rather than a dict
- Server now know connects to Heroku ports when on Heroku rather than localhost 5000
- Updated app on Heroku to remember static and template folder
- Using minified versions of javascript and css files when possible
- Removed mention of Window URL verification in code because on server it only gets the host of the app rather than the host of the iframe
- Fixed issue where one side of button border wasn't showing
- Defaults now assume that user is not logged in rather than otherwise
- Fixed issues where Safari could not parse Facebook event times. Switched to using MomentJS to ensure better browser support
- Changed name of icon font css file
- Switched back to pulling Wix.js file from internet rather than from internal library
- Updated and clarified documentation
- Removed documentation in header of modal.html because it confused Flask server when rendering
- Fixed typos and removed console logging statements
- Added Clndr dependency
- Added Procfile for Heroku
- Added work done on Mobile version of calendar into separate folder