Rio-mbtiles

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- Empty tiles are skipped (34).
- Require rasterio~=1.0 and the Rasterio's dataset overwriting option. Resolves
issue 39.
- Rasterio's resampling options are enabled on the command line (31).
- Require Python version >= 2.7.10. Mbtiles data will not be properly written
with older versions of Python. See commit 57fba73 and
https://bugs.python.org/issue23349.

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- Add --src-nodata and --dst-nodata options, with the same semantics as in
rio-warp (15).
- Require numpy>=1.10 and rasterio>=1.0a2

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- Require rasterio>=1.0a1

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- Register rio-mbtiles to rasterio.rio_plugins (7).
- Use Rasterio's release-test-4 (0.25) wheels to speed up Travis builds (11).

- 1.1.0 (2015-05-11)
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- Rename module from rio_mbtiles to mbtiles (2). Command remains the same.

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- Remove adaptive chunking and commit tiles as soon as possible to keep
program memory well bounded.

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- Initial release. Exports version 1.1 MBTiles with automatic reprojection
and parallel processing. Requires Rasterio >= 0.23.