Add Vec3D class. Plus defined
Add sum of a vec and a number
Merge branch 'master' into vec3d
Add subtract of two vecs
Add subtraction of a vec and a number
Typo
Add multiplication of two vecs
Modify multiplication to use zip and map
Add multiplication of vec3d and number
Fix dot product
Smaller way to define multiplication vec number
Add length of a vec
Add normalized method
Merge branch 'master' into vec3d