Use stack everywhere, fixes #132, #166, #157, and #158 #173
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It is still possible to build the project using cabal, so issues like #148, #149 and #168 remain relevant. I want to track those issues so I can eventually allow hawk to build with other versions of ghc and other versions of the dependencies, but for now it's already enough work just to support a single version of everything, so I'm switching travis to only build that single version for now. Once I manage to close enough issues to make hawk buildable with other versions and other build systems, I will amend the travis configuration to check those workflows too.