Add examples of using list comprehensions
Add numeric example per @kendallc's suggestion
Add reference links to list comprehensions talk
Add another code example to list comprehensions talk
Improve code readability in examples
Fix reStructuredText bugs
Fix size of heading
Add more examples that were demoed during the talk
Fix reStructuredText issue
Simplify examples
Fix indentation in reStructuredText
Add script to run doctests on code examples
Merge pull request #2 from treyhunner/talk/list-comprehensions

Talk: list comprehensions