Add centos-7.0 to the test-kitchen build matrix.
Update build matrix for fedora, ubuntu-14.04.
Update the contributing information.

We no longer use JIRA.
Add metadata information for smartos, omnios.
Bump versions of ChefSpec, Berks and other gems.
Restructure the ChefSpec test coverage files.
Add unit test for git::windows recipe.
Add unit test for git::server recipe.
Rename to CONTRIBUTING.d