Avoid using master branches (that will exist eventually for building on top of AGL master) for the Eel work:
- Rename chromium53 branch @1.agl to @1.agl.eel
- Rename wam branch @1.agl to @1.agl.eel
- Rename meta-agl-lge master branch to eel.
- Update meta-agl-lge to point to the right eel branches of chromium53 and wam.
- Test everything is building properly on top of eel.