Redid examples in first vectorization lab.
Added a new plot to the vectorization lab.
Deleted old plot for vectorization lab.
Added vectorization exercises.
Added solutions for new vectorization problems
Added hints to new vectorization problems.
Added another one-line problem to the vectorization lab.
Some code formatting fixes.
Use proper logscale for plot in vectorization lab.
Added missing pdf for vectorization lab.
Some small edits to the vectorization lab.
Merge branch 'master' into vect
Redid shuffling problem in vectorization lab.
Some edits to the image editor problem.
Fixed a typo and some spacing.
Merge pull request #315 from insertinterestingnamehere/vect

Vectorization lab edits
Some corrections and syntax changes.
Changed to log-scale for plots in cython lab.
Merge pull request #319 from insertinterestingnamehere/cython

Cython
Merge pull request #318 from abefrandsen/develop

Made changes to Lab 5 in volume 1 (complexity and sparse matrices).