Bugfix release: Fix github issue #30 

This fixes github issue 30, related to unicode characters in URL titl… …e attritbutes.

2.3.2 - Bugfix release 

Version 2.3.1 Regression bugfix: empty string input returns empty string again.

'2.3.0' 

Merge branch 'release/2.2.2' 

v2.2.1 

v2.2.0 

Fix a bug where image style attributes no longer worked. Thanks @robnewman.

Version 2.1.7 supports Python 2.6 - 3.3