STYLE: OBJImporter style

Style changes for new class vtkOBJImporter.

0) Indentation
1) canReadFile -> CanReadFile
2) If/elseif/else/while clauses should be on separate lines.
3) Use vtkDebugMacro instead of if(this->DebugOn()
4) Remove blocks of commented code
5) MTLfilename to MTLFileName (required change to
   vtkOBJImporterInternals.h)
6) Replaced all cout, cerr, printf's with Macro's.
7) Removed __ prefix from header blockers
8) Removed null pointer checke before delete.