Make hardcoded items in generate command configurable

[reyostallenberg]

The command flexmodel:generate is only usable in some kind of 'default' Symfony setup.

In order to make it more flexible I think the following should be done:

• Make the parameter objectNamespace in Command/GenerateMappingCommand.php#L44 configurable
• Make the bundle name in Command/GenerateMappingCommand.php#L47 configurable
• Make the ormMappingDirectory in Command/GenerateMappingCommand.php#L49 configurable

There are 2 solutions:

1. Make the values configurable in the app config (app/config/config.yml)
2. Make the values configurable as argument/option of the command

Which is prefered and do you have a proposal for the naming?