Merge branch 'master' of github.com:vhf/free-programming-books
Merge remote-tracking branch 'central/master'
Merge remote-tracking branch 'central/master'
Merge remote-tracking branch 'central/master'
Add Learn Markdown

I added "Learn Markdown" and created the Markdown section.
Add "Compiling Techniques" by F.R.A. Hopgood
Added czech podcasts
Merge pull request #1042 from grogy/czech-podcast

Added czech podcasts
Adds Building REST APIs with Rails book
apprendre l'informatique sans ordinateur
Merge remote-tracking branch 'central/master'
(oublié de le faire plus tôt)
Conflicts:
	free-programming-books-fr.md
création d'une rubrique ad hoc pédagogie pour enfants et adolescents
Merge pull request #1037 from diegowifi/master

Add Learn Markdown
Adding Markdown to Index #1037
Merge pull request #1041 from chastai/add-book

Add "Compiling Techniques" by F.R.A. Hopgood
Merge pull request #1043 from kurenn/master

Building REST APIs with Rails
Merge pull request #1044 from maieul/master

Apprendre l'informatique sans ordinateur
Added NKS to Cellular Automata Book list
Merge pull request #1045 from estrabd/master

Added NKS to Cellular Automata Book list
I added a few new books here and there. Notably, I created entries
for these new languages: Alef, Chapel, Cilk, Limbo, and OpenMP.