fixed not supported line endings \N by just removing them from iri2uri.py

this was necessary to build httplib2 with kivy/buildozer for android using the kivy-virtualbox image (ubuntu 12.10)

there are more changes shown in the diff below..
most them shouldn't make any difference,

the important changes are:
removed any \N within lines 100-106

was not sure about line 50, so I looked it up, and looks like python allows a comma after last list element to reduce diffs after changing multi-line lists.. so this should be okay to keep ;-)