refactor DeploymentService > DeploymentRepository
To support other configuration formats, the DeploymentService should be refactored.
Other formats (instead of the default 'PHP') might be JSON, XML or a implementation fetching the informations from a database or custom webservice.
Instead of the current DeploymentService implementation we need a "DeploymentRepositoryInterface", which can be implemented by a custom DeploymentRepository. Surf should provide then a repository implementation for the current php-file-based configurations.
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