CB-9402 Allow to set gradle distubutionUrl via env variable CORDOVA_ANDROID_GRADLE_DISTRIBUTION_URL
CB-9402 Allow to set gradle distubutionUrl via env variable CORDOVA_ANDROID_GRADLE_DISTRIBUTION_URL

This closes #205

CrandellWS/cordova-android-template,CrandellWS/cordova-android-template,CrandellWS/cordova-android-template