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Added
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* Travis CI integration
* pytest based unit tests
* 'codecov' based code coverage reporting
* Badges for license, latest pypi release, build status, code coverage.
Changed
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* 'add_host' will no longer update hostvars when the 'host' already exists. Updation of hostvars will only be done by 'update_hostvars' function. Same goes for 'add_group' and 'update_groupvars'.