add binding for virtual line navigation

[rphan]

When using vim for non-coding tasks (email, etc) you want to :set wrap because that is how people generally format email in office communications. This makes using traditional vim navigation keys difficult. I set up these bindings to navigate virtual lines a little more easily

[rudle]

I think this behaviour is captured by either the ) operator or the whichwrap option. The latter is described in our current vimrc.

Thanks for the PR!