Conditionally import sqlalchemy-migrate exceptions
Conditionally import sqlalchemy-migrate exceptions

The exceptions moved to migrate.exceptions in 0.6.1

alkadis/vcv,liqd/adhocracy,DanielNeugebauer/adhocracy,alkadis/vcv,phihag/adhocracy,SysTheron/adhocracy,alkadis/vcv,DanielNeugebauer/adhocracy,alkadis/vcv,alkadis/vcv,liqd/adhocracy,DanielNeugebauer/adhocracy,DanielNeugebauer/adhocracy,phihag/adhocracy,phihag/adhocracy,phihag/adhocracy,SysTheron/adhocracy,SysTheron/adhocracy,DanielNeugebauer/adhocracy,liqd/adhocracy,phihag/adhocracy,liqd/adhocracy