fix 2d 3d and export CAD

...designer/170222_Final_Microstructure_Strain_Library.ipynb

voxel_designer/170322_3D Slices .ipynb

voxel_designer/BioVoxel.ipynb

voxel_designer/julia/include/clustering2D.jl

voxel_designer/julia/include/clustering3D.jl

voxel_designer/julia/include/problems.jl

voxel_designer/julia/include/strain.jl

voxel_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/1.dxf

...l_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/10.dxf

...l_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/11.dxf

...l_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/12.dxf

...l_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/13.dxf

...l_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/14.dxf

...l_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/15.dxf

...l_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/16.dxf

...l_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/17.dxf

...l_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/18.dxf

voxel_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/2.dxf

voxel_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/3.dxf

voxel_designer/voxelFaceCAD/library_vol_0.25_ratio_0.0/4.dxf