FIX: compilation on macx 10.9 / clang 3.3 of Sofa and plugins image/frame/Flexible (X11 lib required), and ColladaSceneLoader with latest version of Open Asset Import Library)

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10118 b7f1a160-662a-0410-a6d8-bea165342f16
Image Plugin: add zonegenerator

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10119 b7f1a160-662a-0410-a6d8-bea165342f16
Add collision pipeline doc

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10120 b7f1a160-662a-0410-a6d8-bea165342f16