Exception detection in Pipeline::run()
OpenMesh file reading : manage empty file!
BidirectionalIterator.hxx added!
HalfEdgeBuildInterface.hxx added!
Restructuration of iterator interface.
Merge Conflicts:
	Src/Kernel/ObjectFactory.cxx
	Src/Kernel/ObjectFactory.h
Merge pull request #27 from vvidal/master

Catching exception in Pipeline::run() and allowing empty mesh file read