Merge branch 'jz/apply-quiet-and-allow-empty'

Merge branch 'jz/apply-quiet-and-allow-empty'

"git apply" has been taught to ignore a message without a patch
with the "--allow-empty" option.  It also learned to honor the
"--quiet" option given from the command line.

* jz/apply-quiet-and-allow-empty:
  git-apply: add --allow-empty flag
  git-apply: add --quiet flag