v4.2.1.dev120: Merge pull request #8 from CybercentreCanada/variable_uid_container

Base

• Allow Task model to be able to pass scores assigned to tags
• Allow Service model to contain a configuration for services to request tags with scores
• Allow Result model to compute a list of tags with associated scores from the service result

Core

• Change Dispatcher to keep track of scores assigned to tags throughout submission
• Allow Dispatcher to push tags with scores to services that request them

Service Base

• Change the values of Task's tags (request.task.tags) depending on what was passed to the service from the dispatcher