Geoalchemy2

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* Add dosctrings to remove sphinx warnings adrien-berchet (300)
* Update setup.py to point to new home page location EdwardBetts (296)
* Add an internal function registry adrien-berchet (293)
* Update CI and tests adrien-berchet (286, 287, 303, 307)
* Add doc for functions that are defined for both Geometry and Raster adrien-berchet (285)
* Add new examples in the gallery adrien-berchet (282, 283, 299)

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* Fix ST_AsGeoJSON function adrien-berchet (279)
* Add many missing functions adrien-berchet (276)

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* Use setuptools_scm to manage versions adrien-berchet (271)
* Fix insert/update for RasterElement adrien-berchet (270)

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* Fix __eq__() method in _SpatialElement so it can work with any type adrien-berchet (265)

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* Fix ReadTheDoc compilation adrien-berchet

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* Fix Shapely requirements for Pypy adrien-berchet (262)
* Add a gallery with tests and doc based on examples given in 219, 244 and 251 adrien-berchet (260)
* Add support of the feature version of St_AsGeoJson() adrien-berchet zzzeek (258)
* Add __eq__ to WKBElement and make shape.from_shape() able to create extended elements adrien-berchet matthew-emw (247)
* Extract all SQL concepts from Elements and refactor Raster type adrien-berchet elemoine zzzeek (256)