Readme typo
Readme: add section on contributing changes
Readme tweak to mention npm link
v0.4.0

* `grunt-saucelabs` now included with install, set up with `GruntConfig.registerSauce()`
* New 'preamble-for-dist' multi-task to add version number, author, and license information into dist js files. Set up with `GruntConfig.registerPreambleForDist()`
Add travis build status to README