Front end changes

Changes I made as I worked on some front end ideas.

Changes

• CORS support
  • limited to localhost:8080 at the moment, this will be changed later?
• Password requirements
  • currently 12-55 chars
• Sequel forced to use DateTime instead of Time for timezone reasons.
• User.#email was replaced with User.#username.
  • The email field is still around, but now it's not a (solo) primary account key
• Added in Puma config (whoops)
• See commit messages for more details I probably forgot to include here.