[ci skip] Add Gemnasium badge.

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

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Make default Rake task to be the test task.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
[ci skip] Update the .gitignore file.

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