prepare 0.14.3 release

don't test with python 2.5

update MANIFEST.in

copy mwlib.l10n.py in order to build sdist without mwlib

run recompress

up version to 0.12.11, update changelog

show mwlib(.ext) version and location when running tests

call compile_messages with all argument

up version

update README. up version to 0.12.7.