Merge pull request #34 from ptressel/master

Small cleanup of headers, compile errors.
Power and ground traces
Routed
Proto area; thickened traces
Rear facing sonars; angles adjusted
Silkscreens; smaller sonar board
Silkscreens; smaller sonar board
Merge pull request #35 from TylerFolsom/master

BOM for fabricated PCBs
Using unique name for C3 LED
IO Pinout for C3 module
Merge pull request #36 from ramechitturi/master

Created new header file for C3 pinout
Signal map for the Trio Board
Merge pull request #37 from ramechitturi/master

Signal map for the Trio Board
Spacing on D0-13 now matches Arduino
Moved ICSP
Merge pull request #38 from TylerFolsom/master

Updates to Trio
Partial non-working connectivity test.