Fix package name in README

Fixes #3
Add tests for < 0 values
Fix regex for < 0 values

Fixes #4
Bump version to 0.1.3
Update PostCSS and clean code
Add Travis CI
Merge pull request #7 from ai/travis

Add Travis CI
Merge pull request #6 from ai/postcss03

Update PostCSS and clean code
Add travis CI badge
Bump version to 0.1.4
fix repository url in package.json
Merge pull request #9 from jfache/fix-package-json

fix repository url in package.json
Exports processor
Update and run tests
Update docs
Merge pull request #10 from iamvdo/master

Exports processor