Added Google style guides (official & unofficial)

Added the list from https://code.google.com/p/google-styleguide/, which includes C++, Objective C, Java, Python, HTML/CSS, and Common Lisp. Also added is Ian McDonald's Ruby guide, which was used internally on an unofficial basis but is also thorough.
Merge branch 'patch-1' of github.com:dannguyen/free-programming-books into dannguyen-patch-1

Conflicts:
	free-programming-books.md