Milestone 3

Fixed bug in DatabaseService

-changed connection to a static member
-uses semaphore to keep track of open connections, last accessor closes connection
-fixes #11

Milestone 2

Message passing: complete
Database support: missing
Web server: partial
Web front end: partial
Arduino code: partial

Milestone 1

Milestone 1. First release
-uses application protocol version 0
-supports a single remote module
-driver loaded manually
-messages successfully passed to USB serial->local arduino->xbee->remote arduino