Bump to current versions of lhttp_parser and luv

Fixes creationix/moonslice-luv#14
Fixup samples after bump of luv

References: 42837781430442c12dadc3b0505dce5b96c58caa
Bump lua-pwauth for minor cleanups in lua-pam and build fixes
Integrate lua-pwauth into the buildsystem
Merge remote-tracking branch 'upstream/master'

Conflicts:
	luv
	samples/test-web.lua