fixed bug that didn't resolve the @ColumnFamily name attribute in all cases

class.getSimpleName() was present in several places in the code, added
helper method that scans for the @ColumnFamily annotation name attribute
and uses it as CF name if present, otherwise falls back to
getSimpleName()
Merge pull request #32 from johanbjork/master

fixed bug that didn't resolve the @ColumnFamily name attribute in all cases