Add lambdabot command '@hayoo'

[sebastian-philipp]

<_sebastian_> @hayoo test
<lambdabot> Unknown command, try @list

[ulfsauer0815]

I think they use the hoogle executable with a local database for the @hoogle command.

[sebastian-philipp]

making a hayoo executable is planned anyway. Instead of the local database, this tool would query hayoo.fh-wedel.de

[ulfsauer0815]

nice. Just found the code: https://github.com/mokus0/lambdabot/blob/master/lambdabot-haskell-plugins/src/Lambdabot/Plugin/Haskell/Hoogle.hs