Fixed bug in TRN-135 commit

gocql's MapScan is doing strange things. The argument to MapScan is
advertised to be an output paramanter. But if the map already has
elements, it appears that MapScan flags an error (which AFAICT
it should not).
Opps left a debugging symbol in TRN-135-BugFix.
Merge branch 'master' into TRN-135-BugFix
Merge pull request #111 from iParadigms/TRN-135-BugFix

Trn 135 bug fix