Added 5 micro-libraries

**Euclid**
Recursive Euclidean algorithm for finding the greatest common divisor of two numbers.
https://github.com/daniellmb/Euclids-algorithm

**VidBG**
micro-library for embedding video backgrounds into web pages
https://github.com/daniellmb/Euclids-algorithm

**AOP.js**
Aspect Oriented Programming Micro Library.
https://github.com/daniellmb/aop.js

**DI.js**
Dependency Injection Micro Library.
https://github.com/daniellmb/di.js

**AB.js**
A/B/n Testing Micro Library.
https://github.com/daniellmb/ab.js