Provide Vim support

[jml]

I don't know how to do this, but people would probably like it.

[Julian]

Having a command line flag to either not show the line itself or to just show it on the same line and just outputting something like:

minion/routing.py:76:63:# XXX: foo
minion/routing.py:118:49:# XXX: bar

might be good enough here at least to start -- then you'd just set errorformat=%f:%l:%c:%m and you get vim quickfix support which will let you jump to each TODO.

One step further would be just wrapping that in a Syntastic Checker which isn't much more.

[tomprince]

Maybe something like

set makeprg=all-todos\ %
set erroformat=%E%f:%l:%s:,%Z,%C%m