added polar mask test, fix #38
Merge branch 'memory' of github.com:tjlane/odin into memory
bugfix in tests
patching corners bug found in pypad
added some rings methods for testing on texas

just three methods, can revert anytime
Merge branch 'master' of github.com:tjlane/odin
switched del methods to close methods, fix #72
removed convert_to_kam method on Rings, resolve #63
merged master, removed @dermen experimental code
Merge branch 'memory' of github.com:tjlane/odin into memory