User Must add a Station Identifier on Web before Hardware

[bsalinas]

The user has two ways to create a new station.

The first option is to register it online. This simply involves generating the station identifier and a private passcode associated with that station identifier. When creating the station from the hardware, they must have this passcode.

The user also has a global passcode which can be used if they don't want to create a Station on the website first.

The hardware library should be refactored to take the user id and this passcode. We should maybe look into some sort of encryption to make it harder to snoop this passcode. This could possibly wait though.