Add centos-7.0 to the test-kitchen build matrix.
Add centos-7.0 to the test-kitchen build matrix.

edmunds-chef/git,h4ck3rm1k3/git,chef-cookbooks/git,chef-cookbooks/git,protec-cookbooks/git,vinyar/git,h4ck3rm1k3/git,jssjr/git,h4ck3rm1k3/git,heathsnow/git,optimizely/git,optimizely/git,protec-cookbooks/git,heathsnow/git,heathsnow/git,edmunds-chef/git,edmunds-chef/git,protec-cookbooks/git,jssjr/git,vinyar/git,optimizely/git,jssjr/git,vinyar/git