fix code highlighting
update multi_json dependency
add simple travis.yml with 1.9.3 rubies
Merge branch 'add-travis-ci-integration'

* add-travis-ci-integration:
  add simple travis.yml with 1.9.3 rubies
Merge branch 'fix-readme'

* fix-readme:
  fix code highlighting
Merge branch 'update-multi-json-gem'

* update-multi-json-gem:
  update multi_json dependency