started adding support for the start switch

only the sensor debugging module works right now, still need to add in the grapevine module
reworked sensor class, now much more flexible

still need to add support for grapevine, but most of the groundwork is layed out (but commented out)
changes from last pool test
microcontroller tweaks, added support for second bank of sensors

sensor debugging module can now read second set of i2c sensors, also tweaked thruster debugging interface to use proper port
Merge remote-tracking branch 'origin/dev-integration' into pooltest/7-13-14
Merge branch 'pooltest/7-13-14' into user/irwinj-sensors
added notes about a camera setup that works