v0.2.3

Manifolds v0.2.3

Diff since v0.2.2

Closed issues:

• Add the extrinsic mean estimator (#77)
• set/getindex with broadcast and for Cartesian indices (#180)

Merged pull requests:

• Add missing latex delimiter in docstring for Sphere (#181) (@jlumpe)
• view for AbstractPowerManifold (#182) (@mateuszbaran)
• Extrinsic mean estimator (#183) (@mateuszbaran)