New tests

[xiayufeilucy]

No description provided.

[gatoWololo]

Thanks Lucy!

Could you make the following modifications to the code before we merge it:

• Currently it is hard-coded to spawn 10 threads/workers. Could you make this value parametric based on command line argument input? You can use std::env::args
• Currently the only "real" thread code is sender.send(1 /*token*/); this has every thread send a message to the next thread. No one is ever reading the message and every thread is sending the message. We only want the first thread to send the token and all other threads should wait on it. The code I gave you was just setting up the topology but we need to add the logic for passing the message around the ring.

[gatoWololo]

So this example is more complicated than I originally thought. Here are some comments to fix to get the tests where we want it.