Add unit tests related to #299
Fix kml tests related to #295
Remove blank space
Add a test for st_3Dlength related to #286
Add new unit tests related to the #279 issue.
Note that the signature is 
SELECT ST_ZUpdateLineExtremities('LINESTRING(0 0 , 5 0 1, 10 0 )'::GEOMETRY, 0, 20, false);
or 
SELECT ST_ZUpdateLineExtremities('LINESTRING(0 0 , 5 0 1, 10 0 )'::GEOMETRY, 0, 20, true);.

and not a string parameter for the last argument.
Fix kml gx tag extension
Fix unit tests for ST_Delaunay please read #283
Improve ST_ConstrainedDelaunay tests
Add function ST_Is3D please read #70
Fix message
fix javadoc
Fix ST_Extude NaN z values are replaced by a zero.
Correct the unit tests and improve them.
Add javadoc to ST_Is3D
Ad comma
Improve kml tests
Clean documentation
Clean speel
Fix st_translate that now takes into account the z transformation
Merge pull request #301 from ebocher/fix_functions

Fix several unit tests
Fix several unit tests and add the last but not least St_Is3D function.