Add st_azimuth function
Merge upstream/master into st_azimut
Merge
Merge + use determinist function
Fix parenthesis
Merge pull request #249 from ebocher/st_azimut

Add ST_azimut function as postgis does.
Merge remote-tracking branch 'remotes/upstream/master' into geometryEditors

Conflicts:
	h2spatial-ext/src/main/java/org/h2gis/h2spatialext/CreateSpatialExtension.java
	h2spatial-ext/src/test/java/org/h2gis/h2spatialext/SpatialFunctionTest.java