Update strtotime.jsUpdate strtotime.js

I found strtotime.js parsed a lot of different date formats differently
to php-strtotime. Now the function should be much closer to its php
counterpart.
Update strtotime test #4

Added timezone, so test will return the same result irrespective of
the server's timezone.
Merge branch 'strtotime' of github.com:mfaber/phpjs into mfaber-strtotime

Conflicts:
	functions/datetime/strtotime.js
Merge branch 'master' of github.com:kvz/phpjs

Conflicts:
	functions/datetime/strtotime.js