add: better Makefile, complie only what you need
add: http auth
update README for http auth

show how configure for http backend
Update README.md
change: no need to link -lmosquitto now

copy mosquitto_topic_matches_sub from mosquitto source (1.3.4),
and add USE_BINDED_TOPIC_MATCH in Makefile,
then, auth-plug.so can be link without -lmosquitto
...
fix log when http api can't connect
Merge branch 'master' of https://github.com/jpmens/mosquitto-auth-plug

Conflicts:
	Makefile
Merge branch 'master' of https://github.com/wendal/mosquitto-auth-plug into wendal-master
Added example python api
removed included Mosquitto code
slight cleanup of README
	closes #35
	closes 28