added readme

flector from matrix

flector to matrix

added versor and flector

moved exponentiation into its own trait

reorganized into sub folder files

added better iterators to multivectors

added iter and itermut to multivectors, changed grade_iter to reference

fixed basis issues with quaternions and motors

multivector constant trait

added trait for multivector with constant and added to_dual_quaternion function

log for pga3d motors

exported unary traits

added new motor creation functions

added sandwich product