Update version in citation

Bump version number to 1.4.1

Add assertions to new test cases

Fix array conversion for Direction

Create platypus script

Add add and remove extension tests

Allow configuring the default logger

Replace wrappers with extensions (#252)

Update docs

Add SaveResultsExtension

Replace wrappers with extensions

Some more assertions

Dynamically discover all problem classes

Fix AttributeError args in earlier versions

Use importlib instead of __import__

Initialize result for several algorithms

Switch to pytest style

Add JSON serialization for types, directions, and constraints

Add Direction enum

Move _convert_constraint to Constraint.to_constraint

Warn if overwriting attribute instead of assignment

Adds ability to save and restore from state files (#251)

Fix flake 8 warning

Add version to PlatypusConfig

Fix doc formatting

Fix whitespace on line

Auto detect state file type