Couple of minor frontend improvements

[mattixpet]

• In a less of a developer version the logger.error should NOT LOG ANYTHING
  • And CHANGE some ERRORS to LOGS alongside this.
• Create js/ folder for js
  • Volume meter, recorderjs, services, controllers, etc. etc.
• Remove alerts
• Rename minFreeTokenIdx to highest used token idx
  • Refactor. Very minor, a single variable.
• Use jshint on all javascript
• Simplify message to users not clicking 'Done this before?' and being already in the database
• Combine start and speaker-info page if possible

[judyfong]

highestUsedTokenIDx (for the frontend. it is like Prompts downloaded minus 1)

jshint to find javascript (silent) errors
http://jshint.com/

This message: "Speaker already in database. Choose a different name, unless you have done this before on this device, then tick the box." Issue because people dont read it.