Merge pull request #149 from twitter/new-travis-ci

Use new Travis CI infrastructure

.travis.yml

@@ -1,24 +1,17 @@
 language: ruby
+sudo: false
+cache: bundler
 rvm:
-  - 1.8.7
   - 1.9.3
   - 2.0.0
-  - 2.1.0
-  - rbx-2.2.7
+  - 2.2.0
   - jruby-head
 matrix:
   allow_failures:
-    - rvm: rbx-2.2.7
     - rvm: jruby-head
 env:
   - 'RSPEC_OPTIONS="--tag ~slow spec"'
   - 'RSPEC_OPTIONS="--tag slow spec/bidi/bidi_spec.rb spec/collation/collation_spec.rb"'
   - 'RSPEC_OPTIONS="--tag slow spec/collation/tailoring_spec.rb spec/collation/trie_dumps_spec.rb"'
   - 'RSPEC_OPTIONS="--tag slow spec/formatters/numbers/rbnf/rbnf_spec.rb"'
 script: 'bundle exec rspec $RSPEC_OPTIONS'
-before_install:
-  - gem update --system 2.1.11
-  - gem --version
-  - sudo apt-get update -qq
-  - sudo apt-get install -y libonig-dev
-before_script: 'gem install bundler'