Major changes:
-Improvements to API, no longer has two different file input formats for 2D/3D. Now only accepts 2D or 3D numpy ndarrays. These datat can be read in using helper functions.
-More complete documentation
-More conservative CFL limiting.
-Mesh improvement/sliver removal now uses incremental Delaunay triangulation to accelerate things.
Minor bug fixes:
-Correct 3D domain extension and velocity model adjustments in the extension region.
-Padstyle linear_ramp now works in 3D.