v0.9.1

This minor release brings a large speed-up of the shape-fitting, along with a couple other small improvements.

• Speed up computation of Omega in shape fitting (e2809f1)
• Moved sample_to_mesh out of the ::detail namespace (da0a240)
• Fixed bug that the given num_shape_coefficients_to_fit was not forwarded to the shape-fitting function (42d1f43)