Add /lmgtfy and /lmbtfy commands

`/lmgtfy SignalR Documentation` becomes:
![lmstfyscreenshot](https://cloud.githubusercontent.com/assets/1687386/3526921/2f4c5274-0780-11e4-9298-44a41efc5f28.png)
Removed the duplicate entries (*rebase fail*) - and I combined the `Lmbtfy_DataRequired` (Bing) and `Lmgtfy_DataRequired` (Google) entries into one: `Lmstfy_DataRequired` (s = Search)