ATS-421 : Create Travis build for "alfresco-transform-core" (#21)

* ATS-421 : ATS-400: Create Travis build for "alfresco-transform-core"
   - rename mvn profile from 'enterpriseDocker' to 'local'
   - add config to publish docker image on both Quay and Docker
   - remove unused 'master' profile - similar to ATS, publish images only from master branch and on Release
   - update <distributionManagement> to publish artefacts to Nexus public (rather than Enterprise Releases)
   - add travis build configs
   - include SP branches to travis build
  - add documentation on build&release process

_ci/init.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+echo "=========================== Starting Init Script ==========================="
+PS4="\[\e[35m\]+ \[\e[m\]"
+set -vex
+pushd "$(dirname "${BASH_SOURCE[0]}")/../"
+
+mkdir -p ${HOME}/.m2 && cp -rf _ci/settings.xml ${HOME}/.m2/
+echo "${QUAY_PASSWORD}" | docker login -u="alfresco+bamboo" --password-stdin quay.io
+find "${HOME}/.m2/repository/" -type d -name "*-SNAPSHOT*" | xargs -r -l rm -rf
+
+popd
+set +vex
+echo "=========================== Finishing Init Script =========================="
+