More robust out/output switching.

Port sieve example to warning free code.

Closes rasterio#167.

Moar shapes documentation.

Update change log.

Update change log.

Bump version, note changes.

Also remove the double tag update test, which is crashing. I'll
add back in a new branch.

Update change log.

The rasterio.rio package was missing.

Tests that installed from an sdist would have caught this. Should
look into that.

Closes rasterio#135.

Update authors, change log, version number.

Update change log.