Merge pull request #59 from intel-android/feature/build_env

dynamically pick the environment based on whether a tag is used

.travis.yml

@@ -5,7 +5,8 @@ before_script:
 script:
 - npm test
 - bower install
-- roots compile -e staging
+- echo $TRAVIS_TAG; if [ "$TRAVIS_TAG" != "" ]; then export env='production'; else export env='staging'; fi; echo $env;
+- roots compile -e $env
 node_js:
 - '0.12'
 sudo: false