Hi I've been doing rails for a while, which was really my first
introduction to ruby. I've found my self using ruby more and more and
keep amazing my self about how cool it is, although I've got a few
questions, or rather holes in my ruby knowledge, from rails doing a lot
of stuff for you I think.

1. What does a double colon do in terms of class inheritance. ie.
GameWindow < Gosu::Window ?

2. Why would you want to use nested classes?

3. Is it bad practice to define constance out of classes?

4. How/Can you delete instance variables or objects?
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