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