Include trailing \0 with coinbase sigs if there's room
README: Include jansson PKG_CONFIG_PATH in example for Mac
Bugfix: Check that all pools have URIs set before starting
Merge commit '84b5483' into bfgminer-2.10.x
Merge commit '8f6f9b7' into bfgminer-2.10.x
Merge commit '5f5c85b' into bfgminer-2.10.x