license: move from readme to extra file
license: add license (with link) to package.json
travis: remove node 0.6 testing

Node 0.6 isn't supported anymore.
All tests fail:
https://travis-ci.org/visionmedia/node-querystring/jobs/16909547
Merge pull request #94 from silvinci/fuck-oh-six

travis: remove node 0.6 testing
Merge pull request #92 from silvinci/fuck-legal-shit

license: make license npm registry digestible
Automatically rewritten for npm.