Release Version 1.1

Change Log:

• Fixed bug in gradientDtt1D (missing numDim function)
• Added align_output option to gradientDtt1D
• Updated example_wave_eq_pstd_1D to enforce correct boundary position
• Added example_wave_eq_pstd_1D_non_reflecting to simulate general boundary conditions
• Added example_wsws_gradient to illustrate grid shifting with and without align_output
• Added example_wave_eq_pstd_2D_neumann and example_wave_eq_pstd_2D_dirichlet