Solve prepare issue during transaction. Fixes #27
Update version to 0.32.1
Prevent conversion of nill guids to null values. Fixes #29
Removing constraints from generic DataReader
Excluding constraints from CqlCommand ExecuteReader<T> as well
Improving CqlTransaction, fixing exceptions and adding Reset for reusability. Fixes #27
Adding CqlError as query result type
Reverting class, new() constraint removal, changelog update