Deformers, weights and twist rigging

• Maya's copyDeformerWeights(), copySkinWeights() and deformerWeights() commands have been unified into simple-to-use methods for dumping, loading and copying deformer weights
• Smart new construction and copy methods for skinClusters
• Vector.blend() now supports angle-based blending (for both attributes and values, naturally)
• Easily create and drive twist chains
• And more !

Full Changelog: v0.5.2...v0.6