preserve periodicity for boundaries and full slices
Merge pull request #17 from wijnandhoitinga/master

Added mesh-edgewidth (linewidth) argument to PyPlot.mesh
Merge branch 'master' of https://github.com/nutils/nutils
Add the functionality to add an image to your plot
Orthotropic materials
Merge https://github.com/wijnandhoitinga/nutils