Wugfresh Nexus Root Toolkit is by far the easiest way to flash stock images and root your nexus devices. Today Wugfresh has added support for the Nexus 6. The toolkit is also loaded with lots of other options like the ability to unlock and lock your bootloader, ability to flash a custom recovery, ability to backup and restore your device, push and pull files, and the list goes on and on. The toolkit also has support for Android Lollipop on a large handful of other device such as pretty much every Nexus device, and there is even support for the OnePlus One coming soon! Head to the link below for the download.
Via Wugfresh