ADDED: foundation in cython
CHANGED: rewrote find_span cython and the curve initialiser now takes ctrl_pnts, knots and deg as argumens
CHANGED: adopted constructor to new initialiser
CHANGED: initialiser now takes arguments, adopted constructor and evaluate_at methods uses cython functions
ADDED: unittest for Surface class
FIXED: find_span bug
CHANGED: refactoring
Merge pull request #1 from 4ndr345/cython

Cython