Merge pull request #3 from mmarascio/master

Estilos nuevos, GITIGNORE, Makefile, ...
Merge remote-tracking branch 'upstream/master'
Merge pull request #4 from mmarascio/master

Numerar apartados
week 3 files
Merge branch 'master' of github.com:jvcasill/sas
Renombrar cosas