Small optimisation.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Retire support for Ruby 1.8.x et al ...

This means no support for the following:

  - Ruby 1.8.x (MRI);
  - Ruby Enterprise Edition (REE) 1.8.x;
  - Rubinius 1.8 mode.

Bye bye ...

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Add Coveralls integration.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>