add `Makefile` to work around an `erlang.mk` assumption
add `maps_support/0` function that reports whether `jsx` was
compiled with maps support or not
add `erlang.fake` Makefile to support `erlang.mk`
Kill hipe.cfg
Update erlang.mk
Add travis config
Add git id
Merge https://github.com/talentdeficit/jsx into develop

Conflicts:
	Makefile