updating package.json/bower.json to better fit bower package recommandation

- bower.json was added
- package.json was cleaned up (removed unnecessary properties, adding required ones
- package.json validated by http://package-json-validator.com

note: re-packaging was done by following twitter/bootstrap packaging.
removing minified version as suggested in #341

This commit removes jquery.nicescroll.min.js from the bower.json `main` as suggested by @daviesgeek
and explained in the bower spec http://bower.io/docs/creating-packages/

    `main` string or array: The primary acting files necessary to use your package.
Merge pull request #341 from barraq/master

updating package.json/bower.json to better fit bower recommandation