Expanded capabilities for rio shapes.

Closes #150.
Merge pull request #160 from mapbox/issue150

Expanded capabilities for rio shapes.
Expanded capabilities for rio shapes.

Closes #150.

Switch CLI over to faster transforms.

Also add option for output precision.

Closes #163.
Merge branch 'master' of https://github.com/mapbox/rasterio

Conflicts:
	rasterio/rio/features.py
Bump version and note changes.

0.14 release is imminent.
Moar shapes documentation.
Doc update.