Enable shapely speedups automatically if possible

[InnovativeInventor]

Shapely has a speedups flag that can be set in order to use their performance enhancements written in C. Something like this in __init__.py should suffice:

from shapely import speedups
...
if speedups.available:
    speedups.enable()

Or, perhaps making a light wrapper in maup around shapely's speedups would be better.

[InnovativeInventor]

I am closing this because shapely automatically does this now (after Shapely's 1.6 release).