Create an IO_Tools folder to gather all utility methods for either reading or writing mesh files.
Make Gharial compile under windows 7 64 bits with the checkboc "BUILD_KITWARE_TOOLS" checked.
Split obj reader and vtk reader in separate files to make it possible to compile IO_Tools when vtk is not available
minor modification to be able to build without vtk
Correction for linux.
Merge pull request #62 from vvidal/master

Some works needed to be done before to use .vtp (vtk) file with non-manifold mesh