Version 1.7.1

Set version to 1.7.0 (shapely#822)

* Set version to 1.7.0

* Update credits, readme, change log, other files

* Add __nonzero__ for Python 2.7

Bump version, update change log

Update 1.7a3 release date

Update version and change log for 1.7a2

Update version and change log

Don't test with 3.3

Fixed 404 hyperlinks to JTS webpage

Update version

Update version and change log