v0.8.0

• Fix invalid geometry being generated for ‘river’ cells in CFGrid2D datasets with no cell bounds (pull request #154).
• Improved speed of triangulation for convex polygons (pull request #151).
• Check all polygons in a dataset are valid as part of generating them. This will slow down opening new datasets slightly, but the trade off is worth the added security after the invalid polygons found in pull request #154 (pull request #156).
• Added new emsarray.operations.cache module for generating cache keys based on dataset geometry. (issue #153, pull request #158).