Separate date time parsing

```
Hello,

If you try to parse a separate date time string, datejs returns null.

Example : Date.parse('2010-03-18 12:15:32');

When the combined date/time parse will work well : Date.parse('2010-03-18
12:15:32');

So a great feature would be to allow the parsing of dates in separated
date/time format.
According to Wikipedia, this format is valid in the ISO 8601 (see the block
at the right).
http://en.wikipedia.org/wiki/ISO_8601
```

Original issue reported on code.google.com by `kaz...@gmail.com` on 18 Mar 2010 at 2:12