Fix typeable instance, allow GHC-7.8
monadcatchio-mtl -> exceptions
depend on mtl-2.2.* rather than 2.2.1.*
cleanup cabal file, only support base > 4.5
cabal: network dependency cleanup
travis: allow ghc versions < 7.4 to fail
travis: kill ghc versions < 7.4
cabal: upper bounds on all dependencies
cabal: use less than rather than <= and fix off-by ones
cabal: mtl >= 2.2.1
cabal: mtl upper bounds
Merge pull request #1 from cheecheeo/fix78

Fix78