Added Some Nice Polish to the Ticker Plant

This afternoon was spent testing the ticker plant in all it's glory - that means loading data from the configuration service, checking the login service, and getting ticks moving. I realized that there were several parts of the system that weren't as polished as they should be - specifically in the configuration service client, and even a little in the Broker client code.

The configuration client didn't have a way for me to ask for a series of keys, and wait until all of them had returned. I had to do it one at a time. While it's not horrible, it's not as efficient as the system could be - after all, we created the asynchronous calls to the Broker just for this case.

So I added in the ability to get() a list of keys and have it returned in a variant list. The code actually sends out all the requests for the values asynchronously, and then waits for them all to return. There's a timeout, and a logging, if the complete set of values doesn't come back, but that's not something that's likely to happen.

In the end, I cut 40% off the time needed to get the configuration values this way. Nice.