Fixing examples

example/Grid/0_simple/Makefile

example/Grid/1_stencil/Makefile

example/Grid/2_solve_eq/Makefile

example/Grid/3_gray_scott/Makefile

example/Numerics/PSE/0_Derivative_approx_1D/Makefile

example/Numerics/PSE/1_Diffusion_1D/Makefile

example/Numerics/Stoke_flow/0_2D_incompressible/Makefile

example/Numerics/Stoke_flow/1_3D_incompressible/Makefile

example/Plot/0_simple_graph/Makefile

example/VCluster/0_simple/Makefile

example/Vector/0_simple/Makefile

example/Vector/1_celllist/Makefile

example/Vector/1_ghost_get_put/Makefile

example/Vector/2_expressions/Makefile

example/Vector/3_molecular_dynamic/Makefile

example/Vector/4_complex_prop/Makefile

example/Vector/4_multiphase_celllist_verlet/Makefile

example/Vector/4_reorder/Makefile

example/Vector/5_molecular_dynamic_sym/Makefile

example/Vector/6_complex_usage/Makefile