added script for publishing

publish.sh

+#!/bin/bash
+
+BRANCH=$(git branch --show-current)
+if [ "${BRANCH}" != "master" ]; then
+  echo "publishing can only be done on the master branch."
+  exit 1
+fi
+
+DIFFS_STRING=$(git rev-list --left-right --count master...origin/master)
+DIFFS=($DIFFS_STRING)
+LOCAL=${DIFFS[0]}  # how many commits local is ahead of origin
+REMOTE=${DIFFS[1]} # how many commits origin is ahead of local
+
+# if the master branch on origin is ahead, probably forgot to pull
+if [ "${REMOTE}" != 0 ]; then
+  echo "master branch is ${REMOTE} commits ahead. Pull/merge first."
+  exit 1
+fi
+
+# make sure all tags are available locally
+git fetch --tags
+LAST_TAG=$(git describe --tags --abbrev=0)
+LAST_LOGS=$(git log --color --pretty=oneline HEAD..."${LAST_TAG}")
+LAST_LOG_LINES=$(echo "${LAST_LOGS}" | wc -l)
+
+# count the lines of commits between HEAD and the last named tag
+if [ "${LAST_LOG_LINES}" == 0 ]; then
+  echo "No commits have been detected since the last tag ${LAST_TAG}."
+  exit 1
+fi
+
+echo "commits since last tag:"
+echo "-----------------------"
+echo "${LAST_LOGS}"
+
+VERSION_LEVEL=$1
+if [ "${VERSION_LEVEL}" != "patch" ] && [ "${VERSION_LEVEL}" != "minor" ]; then
+    echo "Usage: ./publish.sh <patch|minor>"
+    exit 1
+fi
+
+bumpversion "${VERSION_LEVEL}" || exit 1
+
+VERSION=$(python -m setup --version)
+echo "new version is: ${VERSION}"
+git add setup.cfg setup.py
+git commit -m "release v${VERSION}"
+git tag "v${VERSION}"
+git push origin "v${VERSION}"
+make release