Added a section about shortest path for unweighted graphs.
Merge pull request #311 from AZaitzeff/bacon

Added a section about shortest path for unweighted graphs.
Changed the order of the labs to math the curriculum outline
Merge pull request #312 from AZaitzeff/order

Changed the order of the labs to math the curriculum outline
Changed order so that matplotlib lab is in the right place.
Merge pull request #313 from insertinterestingnamehere/hotfix

Changed order so that matplotlib lab is in the right place.