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fix travis ci automatic deployment

Merge pull request #20 from umeboshi2/skip-pkg-install-env

use environment var 'PIP_UPGRADER_SKIP_PACKAGE_INSTALLATION' to skip…

fix ci

fix ci

fix ci

fix pypi password

fix tests

Merge pull request #13 from dougalsutherland/license

include LICENSE file in distributions

fix for latest version of pip