PIM-1585: Remove MongoDb use statement to allow to don't use MongoDB bundle
PIM-1585: Add mongodb configuration
PIM-1585: Remove mongo db parameters from config and parameters
PIM-1585: Call mongodb configuration file if needed
PIM-1585: Create mongodb parameters for each environment
Merge branch 'master' into PIM-1585
PIM-1585: Clean AppKernel to add/remove MongoDb implementation
PIM-1585: Move storage_driver configuration into mongodb configuration file
PIM-1585: Update CHANGELOG file
PIM-1585: Add blank line at the end of config file
Merge pull request #569 from akeneo/PIM-1585

[WIP] PIM-1585: Create configuration to switch between ORM and ODM