v0.1.2

This release mostly contains internal clean-ups to facilitate future development.
No changes in user API.

List of updates:

• Deprecates regridder.A in favor of regridder.weights 792e228
• Speed-up test suites by using coarser grids 4152b41
• Use parameterized tests when appropriate 3cf78b9
• Fix small memory leaks from ESMF.Grid 9963d95
• Properly assert ESMF enums bce5bc3