Minor fixes to compile successfully against uclibcxx, and also install the lua frontend.
Merge branch 'master' of github.com:Doodle3D/print3d

Conflicts:
	src/drivers/AbstractDriver.cpp
Change lua interface to 'object-oriented' style; minor fix in abstract driver.
Change va_arg() types to int to avoid warnings, hopefully this will keep working okay.
Update include paths for eclipse project; change building on OSX to generate multi-arch binaries (32bit+64bit).
Add Lua 5.1 compatibility definitions to lua c binding.