unity plugin demo fixes
Merge pull request #79 from GrimReio/unity-plugin-demo-fixes

Unity plugin demo uses Options
flagEndAsync at IABHelper.launchPurchaseFlow() https://github.com/onepf/OpenIAB/pull/83
Merge pull request #84 from oorlov/openiab-pull-83

Missing flagEndAsync at IABHelper.launchPurchaseFlow() https://github.com/onepf/...
Proxy purchase activity. Plugin package renamed
Fix for #88 checkSetupDone throws either if startSetup() is failed or not started
Merge pull request #89 from GrimReio/unity-bug-77

#77 Unity: Proxy purchase activity. Plugin package renamed
setupResult for OpenIabHelper.dispose()
Merge pull request #90 from oorlov/88-openiab

#88 checkSetupDone throws either if startSetup() is failed or not started