Don't clobber Date.now

```
It looks like the locally defined Date.now() is only used in a few places.
Normally, Date.now() returns the EPOCH ms but Date.js redefines it to return
new Date().

Instead of
Date.now = function() { return new Date(); }

I would do something like
Date.nowAsDate = function() { return new Date(); }

and update calls to Date.now() accordingly.

ref
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects
/Date/now
```

Original issue reported on code.google.com by `chad.arm...@cloudsherpas.com` on 18 Jul 2014 at 3:59