Create fake env var for tests

Tests were dependent on a specific HOME environment setup
Merge pull request #10 from Huddle/bug/test-fail-home-env

Create fake env var for tests
updated preprocess
2.3.0
updated preprocess
added travis-ci badge
Create .travis.yml
Merge branch 'master' of https://github.com/onehealth/grunt-preprocess

* 'master' of https://github.com/onehealth/grunt-preprocess:
  Create .travis.yml
  added travis-ci badge