Introduce throttling, close #625
Merge pull request #1397 from excilys/throttling

Introduce throttling, close #625
Fix max-age computation
Fix previous commit
I don't think we need those
Support passing multiple throttling steps, not only chaining. Fix scenario level throttling.
Add bootstrap fro using throttling DSL outside Simulation
Remove useless Init
Fix import
Extract Feeder DSL from Predef into dedicated trait, close #1400
Rename Throttling into ThrottlingSupport
Extract Check DSL bootstrap into dedicated Trait, close #1401
Rename ThrottlingSupport methods to make Unit explicit
Extract Inject DSL from Predef, rename methods, close #1399
Throttling can be bootstrapped directly from Predef
Have a default steps impl in ThrottlingSupport trait
Extract Assertion DSL into dedicated trait, close #1402
Get rid of assertions._ import
Extract Pause DSL into dedicated trait, close #1403
Extract Structure DSL bootstrap into dedicated trait, close #1404