A List of Features for the home page

It might be easier for visitors to the Julia homepage to get an idea of what Julia offers with a list rather than less-scanable paragraphs of text. I'm not attached to the format/phrasing; I just think that a quicker summary of Julia's features in a more prominent place might be good.

I got most of the points and all the wikipedia links from the [Julia Manual's Introduction](http://docs.julialang.org/en/latest/manual/introduction/).