Change localstore to use ids, LZW encode url params

[thisismydesign]

Resolves #25, #9

We use LZW-based encoding cause why not :) We gain 1 character on compression compared to Base64 and more random-looking parameters.

• http://pieroxy.net/blog/pages/lz-string/index.html
• https://github.com/pieroxy/lz-string/