* ATS-400 : Build improvements for TravisCI
Building the LibreOffice docker image takes a long time due to the
large packages that need to be downloaded and installed. This results
in more than 10 minutes of inactivity in the build log and TravisCI
kills the job.
Improvements:
- remove and replace unnecessary steps in Docker builds
- cache LibreOffice GZIP distribution in Travis
* 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