Update readme, add auto-install and exec bit.

[stephen-mw]

These are just some changes I think will be helpful. I think the one-liner install is especially simple for beginners.

• Update the readme to be more clear and readable.
• Add execution bit so that script can be called as ./script. Right now it only works as python script.py.
• Add a single one-liner so people can just quickly install it.

Note that the curl ... | sudo sh command will work once it's been merged in, since I've already pointed it at your repo.

If you want to test it you can run:

curl "https://raw.github.com/stephendotexe/stratum-mining-proxy/master/auto_install.sh" | sudo sh

[CryptoManiac]

Thank you for help :)