change version in setup.py

setup.py -> v0.2.3

setup.py -> v0.2.2

setup.py v0.2->v0.2.1

update README and setup.py with appropriate requirements (keyring, bs4)

Merge pull request astropy#394 from sargas/stop-the-tmp-files

Use BytesIO/StringIO instead of temporary files

changelog entry

Tagging v0.1

First BETA release: v0.1