Add CentOS 7, Debian 6.0.10 and Debian 7.7 to Test Kitchen

.kitchen.yml

@@ -7,6 +7,9 @@ provisioner:
 platforms:
   - name: centos-5.10
   - name: centos-6.5
+  - name: centos-7.0
+  - name: debian-6.0.10
+  - name: debian-7.7
   - name: fedora-19
   - name: fedora-20
   - name: ubuntu-12.04