optimize NonEmptyList foldMap1 (avoid StackOverflowError)
correct comments and boolean functions of nand and nor functions. Correct syntax to call to correct functions.
Merge pull request #332 from xuwei-k/NonEmptyList-foldMap1

optimize NonEmptyList foldMap1 (avoid StackOverflowError)
Merge pull request #339 from AlecZorab/fix-boolean-functions

Fix boolean logic functions.
tweak README

[ci skip]
Fixes #180: include SBT config in README

[ci skip]