Grammar and spacing fixes to the Bézier curves lab.
Some changes in the problems in the Bézier curve lab.
Added Bézier solutions file.
Added the solution code for the numerical stability problem.
Added docstrings to Bézier lab solutions.
Added solutions template for Bézier lab.
Added a note on how to compute the binomial coefficients.
Small clarification.
Merge pull request #459 from insertinterestingnamehere/splines

Updates to the Bézier cuves lab.