draft of changes and additions to T08

Several changes and additions to T08, the biggest of which is the inclusion of a Queue example at the end, to cover the use of std::vector, iterators and stdexcept to help with A3. This way, they can hopefully feel better to start A3, and then we'll get into more gritty details next week. @smiths what do you think of this approach? @scimed1 you are the reviewer for this tutorial from what I can see. @horsmane it would be great if you could also give this a quick look, if you get the chance.

I also threw in a BST example for fun, where I show how to recursively print out the tree in a simple way with indentation showing the levels of the tree.