Enable fast_finish on travis-ci

MSP-11616

If any one build fails the entire build will be marked as failed so the
github status can be written back faster.

Author: limhoff-r7

.travis.yml

@@ -5,6 +5,8 @@ env:
   - RAKE_TASK=spec SPEC_OPTS="--tag ~content"
 
 language: ruby
+matrix:
+  fast_finish: true
 before_install:
   - rake --version
   - sudo apt-get update -qq