feat(vim): add a :Lint command
feat(vim): add a :Lint command

Very crude for now with no config; just something that is going to work
in the majority of repos that I work in -- will inevitably have to make
this grow to accommodate more use cases over time, but it's a start.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent