revert travis config

.travis.yml

-language: python
+language: node_js
 notifications:
   email: false
 before_install:
   - rvm install 2.4.0
-  - wget https://raw.githubusercontent.com/davemachado/build-bot/master/build_bot/requirements.txt
 install:
   - gem install httparty ruby-progressbar
-  - pip install build-bot
-  - pip install -r requirements.txt
 before_script:
   - cd build
 script: