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fix travis pass

Merge pull request #31 from DreamLab/feature/0_8_0_deploy

bump version to 0.8.0, update changelog

update changelog, bump version to 0.7.0

bump version number, add changelog entry for 0.6.3

Merge pull request #20 from DreamLab/feature/more_natural_api

Feature/more natural api

feature: api for metadata. bugfix: typos in README

bugfix: urljoin trims path from AUTH_URL

feature: use OS_ variables if present