Merge pull request #15 from ZettaBot/dev

Dev
Minor change in the updateColumn() function
Merge pull request #16 from ZettaBot/dev

Minor change in the updateColumn() function
Merge pull request #18 from ZettaBot/dev

Dev
Merge pull request #20 from ZettaBot/dev

Bug fix in updateColumn()
Merge pull request #21 from ZettaBot/master

merge