Windows video tutorial:
Mac video tutorial:
Linux video tutorial:
All the files you need in one zip (adb+SuperSU+fastboot+Windows drivers):
Step-by-Step tutorial with photos here:
Also, if you get stuck on bootloop after unlocking bootloader (This happened to me couple times), do a factory reset in stock recovery to fix:
Thanks to shimp208 for the sideload method and working CWM, ChainFire for awesome SuperSU and to all the developers who are worked on CWM recovery!