Enhance CI pipeline

- Support for Pull Requests
- Display build status on commit
- Notify build results on slack
- Support for releasing to artifactory

Closes gh-771

ci/scripts/generate-release-notes.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+set -e
+
+source $(dirname $0)/common.sh
+
+version=$( cat version/version )
+
+milestone=${version%.RELEASE}
+
+java -jar /github-release-notes-generator.jar \
+  --releasenotes.github.username=${GITHUB_USERNAME} \
+  --releasenotes.github.password=${GITHUB_TOKEN} \
+  --releasenotes.github.organization=${GITHUB_ORGANIZATION} \
+  --releasenotes.github.repository=${GITHUB_REPO}  \
+  ${milestone} generated-release-notes/release-notes.md
+
+echo ${version} > generated-release-notes/version
+echo v${version} > generated-release-notes/tag