Add name to all tasks

[c-martinez]

At the moment, tasks get an id generated by concatenating ensamble & simulation -- but ensamble & simulation do not always make sense.

I would suggest to add an identifying label (let's call it name), which gets added to the task. And I would also suggest to add it to every task automatically (without having to explicitly define name in the json file defining the simulation schema). This pull request implements those changes.

However, if accepted, sim-city-webservice would also need to be adjusted to auto-add name to the schema. More add the following lines here:

sim['form'].append('name')
sim['properties']['name'] = { "type": "string" }