Update MessageBox.cfc

Going by this page: http://wiki.coldbox.org/wiki/Plugins:MessageBox.cfm

The function to set a message with "warning" type behaves a bit different than the other 2. You can set a "warning" type msg like this:
getPlugin("MessageBox").setMessage( "warning", "This is a warning message" );
OR
getPlugin("MessageBox").warn( "This is a warning message" );

To make them consistent with the other 2, i propose to have the same facade:
getPlugin("MessageBox").warning( "This is a warning message" );