Geoalchemy2

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* Update test matrix removing Python 3.4 and adding 3.6, 3.7, 3.8 cjmayo (253)
* Add reflection example in doc adrien-berchet (252)
* Fix tests with PostGIS 3 elemoine (250)
* Add default compilation rules to elements and functions which are required for SQLAlchemy < 1.1 adrien-berchet (242)
* Raise an AttributeError when a function does not starts with ST_* adrien-berchet elemoine (240)
* Replace ST_Distance_Sphere by ST_DistanceSphere borisuvarov (237)
* Make shape.to_shape() work for extended WKTElement objects adrien-berchet (236)

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* Add some missing functions adrien-berchet (224)
* Do not register functions.GenericFunction for sqlalchemy>=1.3.4 adrien-berchet (226)
* Redefine the geometry_type/dimension consistency checks elemoine (228)
* Correct a spelling mistake EdwardBetts (229)
* Do not assume the "public" schema elemoine (231)
* Add all geometry constructors adrien-berchet (232)

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* Support WKBElement objects as bind values elemoine (221)
* Document the use of spatial functions in primaryjoin conditions elemoine (222)

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* Change WKBElement to read SRID from the EWKB string SergeBouchut (209)
* Change WKTElement to read SRID from the EWKT string adrien-berchet elemoine (211)

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* Add AsGeoJSON for SpatiaLite TomGoBravo elemoine (204)
* Remove the use_st_prefix argument and use SpatiaLite-compiled functions elemoine (204)

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* Add support for function ST_Azimuth simlmx (175)
* Remove Python 3.3 from the test matrix elemoine (179)
* Correct spelling mistakes EdwardBetts elemoine (180)
* Make WKTElement and WKBElement pickable elemoine (182)
* Add SpatiaLite support elemoine (181)
* Fix to_shape with SpatiaLite elemoine (185)