Add new "silent" setting to AreYouSureOptions

Add new "silent" setting to AreYouSureOptions
Make silent option on AreYouSureOptions optional

Make silent option on AreYouSureOptions optional
Merge pull request #1584 from jonegerton/master

 jquery.areYouSure: Add new "silent" setting to AreYouSureOptions
Merge pull request #1549 from mattbrooks2010/master

Added missing moment and moment.utc overloads.