Alter TaskWarriorShellout such that one can easily define new config overrides in subclasses.
Use a slightly more untuitive data structure for storing config overrides.
Removing unncessary unicode string marker.
Merge pull request #42 from coddingtonbear/allow_subclass_configuration_overrides

Make configuration overrides easier to manage from callers/subclasses
Do not test deletion of completed tasks with Shellout; this operation is not supported by taskwarrior.
Merge pull request #43 from coddingtonbear/fix_test_delete_completed

Do not test deletion of completed tasks with Shellout; this operation is...
Merging in upstream changes.
Adding 'escape_parentheses' option.