Release 0.0.30

This patch bumps the release number to 0.0.30 and also introduces a new
CHANGES.rdoc file intended to document the relevant changes introduced
between releases of the project.

Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>
Merge pull request #52 from jhernand/release_0.0.30

Release 0.0.30