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.
Merge pull request #1046 from estrabd/master

I added a few new books here and there. Notably, I created entries
Added backbone.js book
Add Apprenticeship Patterns
Merge pull request #1049 from suzannehamilton/apprenticeship-patterns

Add Apprenticeship Patterns
Update free-programming-books-tr.md
Merge pull request #1050 from leylaKapi/master

Update free-programming-books-tr.md
Update free-programming-books-tr.md with iOS source
Merge pull request #1048 from arthurvr/master

Added backbone.js book
Merge pull request #1051 from ArslanBilal/patch-1

[tr] - iOS
added free-programming-books-az.md{some Programing language and linux source in Azerbaijan language}
added Azerbaijan Spoken Languages
updated free-programming-books-az.md
added link to elasticsearch definitive guide github repo
updated free-programming-books-az.md{added PHP,HTML,JavaScript source}
updated free-programming-books-az.md{added CSS source}
updated free-programming-books-az.
added vhdl book