v0.2.0

Changed

• Guard against sending a empty draw calls.
• Prevent a breaking change planned for NumPy 1.14.
• Make the class ParticleSimulation pickable.
• Guard against processes not properly started
• Add the '.py' extension to the demo executables.
• Make minor tweaks to the code.

Fixed

• Fix issues specific to Windows.

v0.1.0

• Initial release.