add bit/testBit/popCount
bump version to 1.0.4
avoid bitDefault

not in ghc-7.4, so Travis doesn't like it :(
tests: add bit test
loosen test-framework upper bound
bump version to 1.0.5
rewrite testBit/popCount for ghc-7.4
tests: add popCount test, fix bit_ident prop
bump version to 1.0.6