Fixed bug with retrieving CounterColumns

Lines 

https://github.com/managedfusion/fluentcassandra/blob/master/src/Operations/Helper.cs#L147

and 

https://github.com/managedfusion/fluentcassandra/blob/master/src/Operations/Helper.cs#L149

are flipped - FluentCassandra was attempting to convert CounterColumns into FluentSuperCounterColumns and SuperCounterColumns into FluentCounterColumns. 

2d5df1e - addresses that issue

commit d74bf60 sets it so any column created via FluentColumnFamily.CreateColumn() gets the default validator from the ColumnFamily instead of BytesType - this comes up often in static Composite column families