v0.3.1 release

Changed

• Clearer error message as a SpaTypeError something is used as input/output in an action rule without being declared as such. (#82, #89)

Fixed

• Allow leading comments in actions rules. (#81, #85)
• Gave the basal ganglia a default label. (#84, #88)
• Fixed warning produce by the create_inhibit_node function. (#90)
• Prevent whitespace from being completely removed in action rules. (#92, #93)
• Have the intercept_width argument of IA actually take effect. (#94, #97)