Squashed commit of the following:

commit cdb5d282513802fbbb0a34ff1539eb8e0f0ae7f7
Author: iyatomi takehiro <iyatomi@gmail.com>
Date:   Fri Jan 11 16:41:43 2013 +0900

    remove verbose log in emittable
    add luarocks installation code to build script (ll/lua/build.by)
    add luarocks integrated require and its test

commit 2a4fe3dadb3d2cf06877086ce865797b7fc58de2
Author: iyatomi takehiro <iyatomi@gmail.com>
Date:   Fri Jan 11 02:19:34 2013 +0900

    add luarocks as git submodules
fix luarocks installation scripts
change luarock installation script so that it does not use popd, pushd (because travis env does not support these)
Merge pull request #17 from umegaya/pr/luarocks_integration

Squashed commit of the following: