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