*sh: add 'p' alias
*sh: add 'p' alias

Again, more laziness related to the oft-used patch
operation. Ideally there would be no more than one way
to do this, but sometimes my muscle memory fails me.

Ways to patch as of right now:

  git add --patch
  git patch
  git p
  g add --patch
  g patch
  g p
  p

Most if these I've never done and to be honest `git patch` is what comes
most naturally to me, but of late I've found myself wanting to be a bit
lazier and do `git p` or one of the shorter variants.

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