Date formats

[siatstcolumb]

Suggestion: make a note in the docs that the moment.js short date format specifier differs from the .NET date format:

• moment.js - DD/MM/YYYY
• .NET - dd/MM/yyyy

I used System.Globalization.CultureInfo.CurrentUICulture to supply the data-dateformat value in the table header, and it broke bootstrap-sortable's date sorting. Fixed by applying .ToUpper() to the date format string returned by CurrentUICulture.