remove hint about pyside_postinstall.py

Change-Id: I9ccb7a98ad5dd933432ae71f8131bd297d839fae
remove "egg" from instructions

Change-Id: Ibfd055460b0a4ab4f58f0c872fc287bdd04e753b
use the PyPI upload (==no URL at all)

Change-Id: Ieac31ac15069fbeb4e9ca9b063c96aea083a9213