Parse cache needs expiration policy

[cowsrule]

Any cached date entries may become invalid. In particular, when parsing relative dates such as 'today' / 'tomorrow' / 'yesterday' the cache entries for these must be invalidated when the date changes otherwise they represent the wrong date.

Specifically it looks like this is an issue with the replaceHash where it caches the relative dates once onload.

Quick example:
<< Current Date: 2/2/15 >>
Date.parse('tomorrow') => 2/3/15
<< Current Date 2/3/15 >>
Date.parse('tomorrow') => 2/3/15

[abritinthebay]

Oooo very good point. Hmmm will have to rethink how the cache is implemented (it's very basic and naive right now)