Update free-programming-books.md

Added some books for Erlang
Merge pull request #337 from chuanjin/master

Update free-programming-books.md
lisp book
Links are not rendered correctly on http://resrc.io/list/10/list-of-free-programming-books/#erlang
Merge pull request #339 from clemens-tolboom/patch-1

Links are not rendered correctly on http://resrc.io/
Merge pull request #338 from johand/lisp_book

lisp book
Adding "A pragmatic guide to Backbone.js apps"
Merge pull request #340 from sillero/master

Adding "A pragmatic guide to Backbone.js apps"
Add a backbone tutorial to js frameworks