Adding Microsoft-style JSON Date Deserialization to as3corelib

[dcartoon]

Hi,

We're using as3corelib on a project and needed support for deserializing dates that have been serialized to JSON in the Microsoft format(described in more detail here: http://weblogs.asp.net/bleroy/archive/2008/01/18/dates-and-json.aspx ). I know this isn't a standard format, but I figured that the functionality might be useful to others that have to work with data from Microsoft-based systems.

I haven't added any sort of serialization support since that isn't necessary for our project, but I'm happy to add this if necessary. I'm also happy to make any stylistic changes if those are necessary to get this code back into the main branch. I have a few basic FlexUnit tests for this functionality that I haven't commnitted but would be happy to add if those are useful.

Best Regards,

Dan