Add Build system and C.I., close #55

* add dev dependencies for grunt task
* add grunt config file with tasks to compile and uglify the the source
* add travis config

how to get travis work: http://about.travis-ci.org/blog/2012-08-02-travis-now-syncs-your-repositories-automagically/

btw. the package.json was reformatted through `npm install --save-dev`