Update README.rst

Little correction in "Extract MBTiles content"
Merge pull request #26 from vross/patch-1

Update README.rst
Fix file corruption on Windows
Merge pull request #27 from osuchw/patch-1

Fix file corruption on Windows
Update changelog and authors
Preparing release 2.1.0
Back to development: 2.1.1
Do not hard-code grid(); JSONP callback.
Preparing release 2.1.1
Back to development: 2.1.2
Reduce coverage scope to landez only
Mentioning source should be enough
Add delay between tiles downloads retries