Remove unused second argument to shift

It came from the man page example from getopts, but seems to be an
error, shift doesn't take another argument.
Merge pull request #11 from strongloop/fix-shift-call

Remove unused second argument to shift
Annotate release tags with changelog

Uses slt-changelog to generate brief release notes for embedding
directly into the tag annotation, which conveniently show up in GitHub
as psuedo-releases, which partially addresses #8.