Simpler binary resolution

[jerrinot]

Currently the instructions say:

It's already quite complex and it will become even more complicated when Apple releases ARM-based laptops.
There are also ARM-based Windows boxes, EC2 is pushing ARM instances, etc.

So it would be nice if we could simplify the instructions a bit. Something godownloader could help.

This is how it could look like for all supported platforms: curl -L --http1.1 https://cloud.hazelcast.com/hzcloud-cli | sh -s -- -b /<path-to-directory>/bin It's basically a script which will check a platform and download the right binary.