ContentLoader Date Parsing Patch

[Josh Kennedy]

I have created a patch to the ContentLoader to include the ability to  
be date aware from the JSON reader.  It runs a regular expression  
against the value if it is a string to try and determine how it should  
be handled, and calls the ContentCreator with the PropertyType.Date as  
the third parameter.  The Content Creator runs the regular expression  
again to enable support for multiple date formats.  It handles both  
date arrays and single date fields.

Not sure if I can create a JIRA issue for this, or what the process  
for inclusion is.  Let me know if there are any questions or changes  
needed for it to be included.