Added Sinatra book
Added frequently updated Ruby on Rails guides
merged security in the language-agnostic section with cryptography
added Security Engineering
Fundamentals to c. programming added
Merge pull request #416 from katgironpe/master

Added frequently updated resources for Sinatra and Ruby on Rails
Merge pull request #417 from hkopp/master

Security vs. Cryptography
Merge branch 'master' of github.com:borislavvv/free-programming-books into borislavvv-master

Conflicts:
	free-programming-books.md
Add Lisp Web Tails book