Two files from utils, coffee→javascript.

They didn't have tests. May want to write some tests for these, but I wasn't
sure how to.

Error messages would either be stupidly simple (checking if it
returns a string), or would recreate the whole function inside the spec.

localStore, I suppose it would be straghtforward to test?
set lp.supports.localStorage to true and false, and check localStorage and
cookies? Does that make sense?