[API] I18n datetime

Zend localised dates integration.
API Change: now Date->Format() will use Zend date format. en_US locale will return dates in US format, additional function for Date->Short() to return dates in 31.03.2008 format

Additional info here: 
http://framework.zend.com/manual/1.12/en/zend.date.constants.html#zend.date.constants.selfdefinedformats