Complete rewrite by Texas Toland (@texastoland)

• Plain functions instead of record like syntax. The old syntax
  triggered compiler bugs, also the new syntax is more idiomatic PureScript.
• localStorage and sessionStorage have to be retrieved first - which is
  safer, as this might fail in certain environments.
• Mock storage based on a simple JS object.
• We have a test suite! yeah!
• Alternative JSON based access available for types not having a Generic instance.

All work done in this release is thanks to Mr. Texas Toland, thank you!