Negative timezones aren't supported

[denevell]

Using the code

 Span d = Chronic.parse(date); 

With date referring to the examples below.

This doesn't parse (the variable d above returns null):

 2012-11-18 12:44:11 -0500

It seems the negative timezone is making the library fail.

When you remove "-0500" it does parse.

Can we please support negative timezones?

[PurpleCatfish]

sounds like not fixed. Is it ?