Faster build time with --disable-gems

.travis.yml

@@ -1,14 +1,15 @@
+before_install:
+  - rvm use 2.1.0 --install --binary --fuzzy
+  - export BUNDLE_GEMFILE=$PWD/Gemfile
+  - ruby --version
+  - rvm --version
+  - gem --version
 language: go
 go:
   - 1.2
 install:
   - script/bootstrap
   - export PATH="$HOME/gopath/bin:$PATH"
-  - rvm use 2.1.0 --install --binary --fuzzy
-  - export BUNDLE_GEMFILE=$PWD/Gemfile
-  - ruby --version
-  - rvm --version
-  - gem --version
   - script/cached-bundle install --deployment --without development
 script:
   - script/build