Catch driver specific 'AlreadyExists' exception on table create
Merge pull request #95 from ikhudoshyn/process-driver-exception-on-table-create

Catch driver specific 'AlreadyExists' exception on table create
Merge pull request #96 from dukhlov/master

unit tests are fixed, pep8 rules are satisfied
global environment initialisation is refactored
Merge branch 'master' of https://github.com/Mirantis/magnetodb
unit tests are fixed, pep8 rules are satisfied