fix up thor includes, add all m4s so that every lib can be a dep if someone wants to use it
dont need return in the ac check program
Merge remote-tracking branch 'origin/master' into thor_incdep
Merge pull request #6 from valhalla/thor_incdep

fix includes add extra m4s
Merge branch 'master' of https://github.com/valhalla/thor into gdg