Fix Simplify service to first build against GDAL 1.11.0 and to be able to handle FeatureCollection as other services.

git-svn-id: http://svn.zoo-project.org/svn/trunk@497 4b6b6ad6-68b3-4dcc-9231-bd9b83bc5dc3
Avoid issue [http://lists.osgeo.org/pipermail/zoo-discuss/2014-August/001152.html repported] on the mailing list.

git-svn-id: http://svn.zoo-project.org/svn/trunk@498 4b6b6ad6-68b3-4dcc-9231-bd9b83bc5dc3
Small fix in applyTwo for services taking two parameters and returning a FeatureCollection.

git-svn-id: http://svn.zoo-project.org/svn/trunk@499 4b6b6ad6-68b3-4dcc-9231-bd9b83bc5dc3