fixes #8 - improve error handling
Merge pull request #9 from DavidHamm/google-play-publisher-8

fixes #8 - improve error handling
fixes #10 - remove default apk file path
Merge pull request #12 from DavidHamm/google-play-publisher-10

fixes #10 - remove default apk file path
fixes #13 - form validation
Merge pull request #14 from DavidHamm/google-play-publisher-13

fixes #13 - form validation
release 0.2.0