Added Alex's exercise for lecture 1
Extra commit to add Alex's exercise for lecture 1 because git seems to not commit by default the files that are modified
Added some style and indentation changes to Alex's exercise in lecture 1
Added the exercise of Alex and Ivan for lecture 2
Corrected the first exercise: now it contains the construction of the polytope in Polymake
Fixed typo
Merge pull request #15 from alex-alvarez/master

Added my exercises for lectures 1 and 2