(1) Add Makefile for easy build via knitr and pandoc (no rmarkdown or knitrBootstrap dependency); (2) modify "master.html" styling and provide requiste resources
(1) Clean up 'estilos.css'; (2) rebuild 'master.html'
(1) Merge upstream/master; (2) add ".gitignore"
Reapply new styling to "master.html"
(1) Specify additional TOC level in "Makefile"; (2) modify header styling in "estilos.css"; (3) remake "master.html"
Merge pull request #3 from mmarascio/master

Estilos nuevos, GITIGNORE, Makefile, ...