Small Update to Readme

- instruction to load submodule
- removed libluajit from deps since it's in the submodule
Merge pull request #11 from duk3luk3/readme-update

Small Update to Readme
use Lua 5.2 __len and __ipair for bufArrays
nicer parseable output on stdout, readable output on stderr, fprintf
Add histogram class, test in l2-load-latency example