beaglebone: initial creation

Currently loads a script onto the board that will start Dweeting.

Example: http://beagleboard.org/static/freeboard/?address=192.168.2.50

TODO:
* Set date/time and timestamp messages
* Fetch the dweetio name
* Specify the attached hardware in the dweet
* Load a visualization based on the attached hardware
* Load custom data collection and visualization based on attached Cape
* Handle USB teathering case (teather to configure, assign a dweet name somehow, start dweeting once connected via Ethernet/Wifi)
* Improve error handling