Gradle wrapper in environments that require controlled builds

[ddimitrov (Dimitar Dimitrov)]

3 years and 3 days later - the 3rd incarnation of my patch is public!

Support for gradle wrapper distribution mirror

Ok, it’s here now - a fresh take on the same old chestnut. Allows to override wrapper properties by only specifying environment variables. Let me know how it works for you. I’ve earmarked some improvements as well (search TODO), but they can wait for another day - it is almost 2am and I’m going to bed!