Changes to release docs.
merging with pull
simplified install instructions
merging local changes
Merge pull request #317 from pastephens/master

Changes to install and release docs
- working on multipolygon bug
fixes #318

Issue seems to have been a couple small typos, things that didn't get
changes properly.
Merge branch 'master' of github.com:pysal/pysal into geojson
- working multipolygon example