Normalize socket-io communication

[ChristianSch]

Every route in the api should have its predefined actions, where all of them should be implemented. Yet to be determined.

[ChristianSch]

To normalise the socket communication we have to employ some kind of scheme.

Considerations:

• events shall be: updated, added, removed
• resources shall be: experiment, experiments, model, models, measurement, measurements.
  • a singular resource shall be identified by parent _id's (if applicable) and the resource's _id
  • resource collections like experiments are not identified
  • resource collections with parents (like models) are identified by parent _id's
• socket naming shall be a combination of [resource]-[event]. the data must hold all neccessary identifiers.

Example:

(
    'name': 'measurement-added',
    'payload': { experiment_id: SOME_ID, model_id: SOME_ID, _id: MEASUREMENT_ID, value: x, name: x, epoch: x, step: x }
)