Add st_minimumdiameter and found a bug in the equals method
Fix unit test on st_minimumdiameter
Fix header
Fix grammar
Merge upstream/master into ST_minimumdiameter

Conflicts:
	h2spatial-ext/src/main/java/org/h2gis/h2spatialext/CreateSpatialExtension.java
	h2spatial-ext/src/test/java/org/h2gis/h2spatialext/SpatialFunctionTest.java
Update gitignore
Merge with master
Fix geometry return and function type
Merge pull request #243 from ebocher/ST_minimumdiameter

Add ST_MinimumDiameter function.
Merge + use determinist function