Added more arithmetic primitive procedures
Updated .gitignore and .gitmodules
Added factorial test case
Removed the loc.sh.

I found the cloc utility is much more useful :-)
Added r_fold
Made all static GC functions inlined
Added r_eval_from_string and r_eval_from_cstr
Now r_fixnum_new doesn't normalize newly created fixnums
Added r_eval_from_string and r_eval_from_cstr
Inlined several VM instruction executor functions
Release objects in VM registers when the VM is destroyed
Normalized fixnums created by number reader
Released objects in RState when RState is destroyed
Test cases updated
Added '+', '-', and '*' for the number tower