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
Add ST_Acc in CreateSpatialExtension
Simplify Javadoc

Following the "Don't repeat yourself" method.
This should have been done in #312.
Merge pull request #313 from agouge/312

Simplify Javadoc
 Following the "Don't repeat yourself" method. (This info is already in the function remarks.)
This should have been done in #312.