Allow destination shape to be specified in reproject()

[davidbrochart]

• Tests added
• Fully documented, including docs/history.rst for all changes and docs/rioxarray.rst for new API

[davidbrochart]

This PR is ready to be reviewed. It allows passing dst_height and dst_width instead of resolution in calculate_default_transform.
Please note that flake8 v3.8 will break.

[snowman2]

@davidbrochart, this looks great, thanks 👍. Just a minor comment above and I think that it would be good to add another test that ensures the output shape is expected when using the shape argument. Would you mind adding that in?

[snowman2]

Also, just thought of this - mind adding .. versionadded:: 0.0.27 shape to above the parameters section in the docstrings of both reproject methods?

[snowman2]

@davidbrochart did you want to squash your commits with me doing a merge commit or would you rather I just do a squash-and-merge?

[davidbrochart]

Yes, please go ahead and do a squash-and-merge.

[snowman2]

Thanks @davidbrochart for this addition 👍

[davidbrochart]

Thanks a lot for this awesome library!