Use bundler cache

as described on http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/
aasm · Dec 18, 2014 · 5a57203 · 5a57203
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commit 5a57203
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diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,5 @@
 language: ruby
+cache: bundler
 
 rvm:
   # - 1.8.7