Add Geometry::fromJson($geoJson)

[grimzy]

To complete API with JsonSerializable

[saintplay]

Thanks for this awesome package, hopefully we can see this feature soon, it will be available for all version of mysql?

[grimzy]

I haven't had a lot of time to work on this package recently but planing to resume the development of this feature in January 2018.
And yes, this feature should be available for MySQL 5.5+ (I'll be 100% sure after writing/running the tests).

Any suggestions regarding the implementation? You can already look at the from-geojson branch.