Add preliminary support for the info box via the payload section of the execute_reply message.

You can see this working when you use the :t magic command. It opens an info box at the bottom of the page. Currently this just shows the type, but we could get more documentation, hoogle requests, etc. to show up there.
Merge branch 'master' of https://github.com/gibiansky/IHaskell into tooltip
Add basic Hoogle command line search capabilities using Shelly
Add directive processing for :h commands. Currently calls hoogle search.