Merge pull request #10 from anacmendes/master

Corrections to day 0.
Added a subsection about exceptions.
Merge pull request #11 from capcarr/master

Day 0 review
Extended profiling section on day 0. Minor corrections.
More minor corrections.
small changes on day 1 and day 2.
Small correction to classifiers.tex
Merge pull request #12 from capcarr/master

Small correction to classification.tex (Day 1)
small changes on day 2 and day 3
Merge branch 'master' of github.com:gracaninja/lxmls_guide
Corrected compilation problem