ENH: Add `doctest_skip_parser` allowing conditional skipping of doctests
FIX: Skip `viewer.show()` commands which hang Travis
Remove duplicate greycomatrix function definitions
Add test case for *_boundaries functions
Test invalid inplace operation
Add missing deprecation removal to todo
Add missing deprecation removal to todo
Add test case for union of heterogenous tform types
Add test cases for abstract geometric base class
Test invalid input
Test scale determination for 0 rotation
Add missing test coverage of polynomial tform
Add test case for estimate_transform
Add matrix_transform function to namespace
Deprecate reverse_map parameter and add to future removal list
Add test case for invalid image dimensions
Fix bug in inverse warping and add test case
Rename test to enable hidden line model test
Increase test coverage of regionprops
Add test for invalid parameter combination