Try to build Pi images under Travis.
Try to build Pi images under Travis.

REANNZ/faucet,trungdtbk/faucet,wackerly/faucet,wackerly/faucet,shivarammysore/faucet,mwutzke/faucet,trentindav/faucet,shivarammysore/faucet,faucetsdn/faucet,mwutzke/faucet,anarkiwi/faucet,gizmoguy/faucet,trentindav/faucet,anarkiwi/faucet,faucetsdn/faucet,gizmoguy/faucet,REANNZ/faucet,trungdtbk/faucet