BlinkStick: Rearranging and refactoring

- Addition of BlinkStick::VERSION to the Gemfile.
- Extraction of color specific methods.
Color Module renaming.

As the specs didn't pass I corrected the namespace to the one in the specs.
Test Refactoring and moving.

BlinkStickTest was corrected according to the code change.

Moved the ColorTest to the correct folder, semantic wise.
VersionTest

Reactivated the version test.
ColorHandlerTest

Tests for some of the color handler methods.