Add book on Backbone.js, sort Backbone books

Added: Building Single Page Web Apps with Backbone.js
Fix sorting order
Removed duplicate entry (Google Java style guide)
Merge pull request #683 from BryanSLam/patch-1

Removed duplicate entry (Google Java style guide)
Two "Non-Programmers" tutorials for python 2.6&3 added
Merge pull request #685 from krzysztofr/master

Two "Non-Programmers" tutorials for python 2.6&3 added
dodaje pythona, c, c++, sql
Adding AJAX to the list. Edit some books positions to be consistent with: CONTRIBUTING.md
Merge pull request #687 from matysanchez/master

Adding AJAX to the list. Edit some books positions to be consistent with: CONTRIBUTING.md
Merge pull request #686 from agilob/patch-1

adding python, c, c++, sql to the list in Polish
Merge pull request #681 from JIghtuse/master

Add book on Backbone.js, sort Backbone books
spelling
Merge pull request #689 from borgified/master

LICENCE->LICENSE
fix broken url
Merge pull request #690 from borgified/fix_url

fix broken url
Merge pull request #684 from esparta/master

[es] Updated info
[es] Added Compendio de Ingenieria del Software