Added 3 books

Added Apprenticeship Patterns to Professional Development.
Added How to Do What You Love & Earn What You're Worth as a Programmer to Professional Development.
Added Game Programming Patterns to Misc.
Merge branch 'master' of github.com:shwei/free-programming-books into shwei-master

Conflicts:
	free-programming-books.md
Merge branch 'shwei-master'