C++ Improvements

- Added a section on references
- Cleaned up and rephrased comments
- Removed old and erroneous information
- Normalized indentation to four spaces
- Normalized style to "Stroustrup style"  (http://www.stroustrup.com/bs_faq2.html#layout-style)

In the near future I plan on additional sections covering idiomatic use, such as RAII and C++11 paradigms.
I am a little on the edge on this one. I am guessing this is a function declaration, which is great to have because it is important to the language but because two_ints() is not written anywhere this will make the code break and a reader may get confused. So this should probably just be a blank function instead?