Travis ci integration
adding lcov support to close the task
We can't support too old version

https://travis-ci.org/jrottenberg/node-captions/jobs/43125693
https://travis-ci.org/jrottenberg/node-captions/jobs/43125692
npm * to simplify commands

npm knows by default about app in node_modules/.bin/
Merge pull request #12 from jrottenberg/coverage-task

Coverage task