Version bump to 3.0.3

Version bump to 3.0.2.

Fix for issue #34 - batch tagging support

Adding travis integration.

Fix for image retrieval and null release year.

* Fixes image download issue reported in issue #29 and issue #26
* Utilize oauth functionality that is wired into discogs-client lib (issue #28)
* Address bug when parsing a null or empty year value (issue #26)

version updates for 2.0.0

updating setup.py to version 1.4.1

version 1.4.0

README.md touch ups.