I also have a Galaxy Nexus and I am used to install ROMs via CWM using adb sideload.
Works perfectely on the GNex.
But not on the N4, using TWRP, not CWM.
ADB works, currently I am using push to get files onto and install it manually.
But I'd like to use sideload, it is easier for me.
I get the following error:
sideload failed to write data protocol fault