Keep testing on puppet 2.7

The modulesync config repo is dropping universal support for puppet
2.7, but individual repos should still keep support until the next
naturally-occuring major release.

Author: Colleen Murphy

.sync.yml

@@ -1,4 +1,10 @@
 ---
+.travis.yml:
+  extras:
+  - rvm: 1.8.7
+    env: PUPPET_GEM_VERSION="~> 2.7.0" FACTER_GEM_VERSION="~> 1.6.0"
+  - rvm: 1.8.7
+    env: PUPPET_GEM_VERSION="~> 2.7.0" FACTER_GEM_VERSION="~> 1.7.0"
 Gemfile:
   optional:
   ':development, :unit_tests':