Removed compilation of C libraries.

This component doesn't use any of these C libraries (they were copied over from
opener-opinion-detector-base).
Removed Git submodules Rake task.

This repository doesn't have any submodules.
Release 2.0.1.

This release removes a lot of C code that was shipped with the Gem and compiled
upon installation. Since this Gem didn't use any of it there's no point in
keeping it around.