add black box tests
Merge pull request #2 from y-kamiya/develop

add black box test
Version 0.0.8
get test coverage using hpc and coveralls
Merge pull request #3 from y-kamiya/develop

get test coverage using hpc and coveralls
Redirect stderr to that of parent
Version 0.0.9
Add ghc-7.8.3 to .travis.yml