"yesterday week" returns equivalent to "next week"

```
Date.parse("yesterday week").equals(Date.parse("next week")); //
[PASS]which is not good

The following should pass...
Date.parse("yesterday week").equals(Date.parse("next week").add(-1).day());
// currently fails

This is a bit of known issue when combining Relative dates ("tomorrow")
with date math ("+week"). One hand is not talking to the other.

A fix is planned and should be available in the next release (Beta 1) of
the Parser.

```

Original issue reported on code.google.com by `geoff%co...@gtempaccount.com` on 27 Nov 2007 at 10:36