Add [publish binary] message to release task

With these Makefile changes, merging master into osx-node-pre-gyp during the
'make release task' will:

- always force a commit
- add a "[publish binary]" message to the commit to tell Travis to build and
publish a new binary
Merge pull request #321 from hybridgroup/makefile-merge-commit

Add [publish binary] message to release task
Make sure to redirect package publishing to stream
Merge pull request #322 from hybridgroup/print-package-publish

Make sure to redirect package publishing to stream
Adding keys.
ENCRYPTING IT LIKE OPENSSL -- too soon?
And now we can [publish binary]
Merge branch 'master' into osx-node-pre-gyp with updated secure env
vars and [publish binary].