[w3c/uievents] build.py: get it working under Python 3 (#254)

Only minor tweaks to print usage are needed to get `./build.py`
passing with latest bikeshed.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/uievents/pull/254

-- Commit Summary --

  * build.py: get it working under Python 3

-- File Changes --

    M build.py (14)

-- Patch Links --

https://github.com/w3c/uievents/pull/254.patch
https://github.com/w3c/uievents/pull/254.diff

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https://github.com/w3c/uievents/pull/254