[Language] Project Euler Hacking session - for comprehensions and folding

[eloots]

Added the code that I used in my presentation to the repo in my project branch.

The part about folding wasn't presented due to a lack of time.

Note that it talks about foldLeft and foldRight in particular and describes a different forms of using these operators. For the sake of completeness, it also shows the so called 'domino' style that never really gained momentum ;-)

As mentioned during the presentation, there is a very interesting series of blog articles about Scala written by Daniel Westheide. You can find these here