Merge devel to master.

. Source grc.bashrc if it exists

. Install using full back to brew since no reason to believe it'll be
in our PATH.

. Add $BREW_ROOT/bin *only* to PATH. Don't add $BREW_LIB/lib to
LD_LIBRARY_PATH.

. Disable $BREW_OPT_LIBEXEC/gnubin and $BREW_OPT_LIBEXEC/gnuman.

. Add go, nodejs

. Revert previous changes to zato/path.bash
Remove mosquito/ in favor of mosquitto/