Travis-CI Integration

Travis-CI integration for dscr.

Note:

1. To enable Travis, sign in https://travis-ci.org using your GitHub account, and turn on Travis for dscr by flipping the switch at https://travis-ci.org/profile .

2. Please remember to replace the username `road2stat` to `stephens999` for this line

`[![Build Status](https://travis-ci.org/road2stat/dscr.png?branch=master)](https://travis-ci.org/road2stat/dscr)`

in `README.md` after merging the PR.