Remove `assetsDir` variable, as `generateBundledResourcesHash.js` should output `CodePushHash.json` to `jsBundleDir${targetName}` folder, and not the hardcoded `$buildDir/intermediates/assets/${targetPath}` one.
In case version of 'Android Plugin for Gradle'' is lower than 1.3.0
'$buildDir' has slightly different structure - 'merged' folder
does not exists so '${targetPath}' folder contains directly in 'res' folder.
Fix issue https://github.com/Microsoft/react-native-code-push/issues/584