Rooting (Nexus 4) on Android (4.4 KRT16O KitKat) with TWRP Recovery
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Step 0 - Download Android SDK from the Android Developers website and install with USB drivers.
Step 1 - Download Fastboot and extract it to android-sdk-linux_x86/platform-tools/ (on windows 'android-sdk-windowsplatform-tools' or similar . I'm not sure. I don't have windows. I hate it.) directory.
	NOTE: Skip Steps 1 and 2 if they are already installed.
Step 2 - Make sure the 'adb' and 'flashboot' on $PATH
Step 3 - Download SuperSU v1.69.zip and copy it to platform-tools folder.
Step 4 - Then Power off the phone.
Step 5 -  Download TWRP 2.6.3.3 and copy it to the android-sdk-linux_x86/platform-tools directory on your computer.
Step 6 - Connect the phone to computer via USB cable.
Step 7 - Reboot Nexus 4 in Fastboot Mode. To do so, browse to platform-tools folder under SDK and launch Command Prompt (hold Shift with Right-click and then choose Open Command Prompt). Now type: and press enter.
	adb reboot bootloader
Step 8 - Then enter the following command to flash TWRP recovery via Command Prompt: 
	fastboot flash recovery openrecovery-twrp-2.6.3.3-mako.img
Step 9 - Wait until TWRP recovery is completely flashed and then enter the following command to reboot the phone in recovery mode:
	adb reboot recovery
Step 10 - Go to Advanced option in TWRP recovery and ensure the device is still connected to the computer.
Step 11 - Choose ADB Sideload option and then enter the command line:
	adb sideload UPDATE-SuperSU-v1.69.zip
	
	If receive 'error: insufficient permissions for device' , try :
	a)adb kill-server 		# kill the started server
	b)sudo adb start-server 	# re-start adb server
	c)sudo adb devices 		# verify the device connected
	
Step 12 - Wait until the installation process completes and then reboot the phone in Normal mode.
Step 13 - Disconnect the phone from computer. Launch Google Play Store on the phone and update SuperSU.

Your Nexus 4 E960 is now successfully rooted on Android 4.4 KRT16O KitKat with TWRP recovery installed. Check for the SuperSU app in your apps list to verify root access is working.