Updates to vimrc

I increased the maximum number of columns to highlight in order to
improve the visual display of text (I have some 90 characters lines in
my work).

The statusline now shows if I have auto rewrapping setup in this
FileType. The code to highlight lines longer than 80 characters is
just... cute.

The ruby_path now points to a generic ruby, allowing me to update Ruby
with RVM without major headaches.