Remove hedge slogan

examples/advection/advection.py

examples/advection/var-velocity.py

examples/advection/weak.py

examples/burgers/burgers.py

examples/gas_dynamics/box-in-box.py

examples/gas_dynamics/euler/sine-wave.py

examples/gas_dynamics/euler/vortex-adaptive-grid.py

examples/gas_dynamics/euler/vortex-sources.py

examples/gas_dynamics/euler/vortex.py

examples/gas_dynamics/gas_dynamics_initials.py

examples/gas_dynamics/lbm-simple.py

examples/gas_dynamics/naca.py

examples/gas_dynamics/navierstokes/shearflow.py

examples/gas_dynamics/square.py

examples/gas_dynamics/wing.py

examples/heat/heat.py

examples/maxwell/analytic_solutions.py

examples/maxwell/cavities.py

examples/maxwell/dipole.py

examples/maxwell/inhom-cavity.py