fix validation bug
Merge branch 'master' of https://github.com/Sigma-2014-Video-Rental-Store-Project/Workspace
Merge branch 'master' of https://github.com/Sigma-2014-Video-Rental-Store-Project/Workspace
create AddNewCustomerCommand
Merge branch 'master' of https://github.com/Sigma-2014-Video-Rental-Store-Project/Workspace