Merge branch 'logpyle' into 'master'

grudge/symbolic/compiler.py

requirements.txt

test/test_mpi_communication.py

unported-examples/advection/advection.py

unported-examples/benchmark_grudge/benchmark_mpi.py

unported-examples/burgers/burgers.py

unported-examples/gas_dynamics/box-in-box.py

unported-examples/gas_dynamics/euler/sine-wave.py

unported-examples/gas_dynamics/euler/sod-2d.py

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

unported-examples/gas_dynamics/euler/vortex-sources.py

unported-examples/gas_dynamics/euler/vortex.py

unported-examples/gas_dynamics/naca.py

unported-examples/gas_dynamics/navierstokes/shearflow.py

unported-examples/gas_dynamics/square.py

unported-examples/gas_dynamics/wing.py

unported-examples/heat/heat.py

unported-examples/maxwell/maxwell-2d.py

unported-examples/maxwell/maxwell-pml.py

unported-examples/wave/wiggly.py