Update runtime.system API

[ecarriou]

Before we have this signature for runtime.system API:

runtime.system(name: string)

now:

runtime.system(params: any)

we can:

• create a system by just passing a string for the name (as before) or
• create a system by passing a configuration object.

example:

runtime.system({ '_id':' 'internalId', 'name' : 'my_system_name', 'version' : 1234, 'description: 'some infos about the system...' })