Add /lmgtfy and /lmbtfy commands

`/lmgtfy SignalR Documentation` becomes:
![lmstfyscreenshot](https://cloud.githubusercontent.com/assets/1687386/3526921/2f4c5274-0780-11e4-9298-44a41efc5f28.png)
I'm on the fence about this bit and want to wait for a decision from davidfowl.  We might wind up switching this to being mandatory and not requiring an @ (which is our convention elsewhere)...