* Update documentation and provide an example compose file for postgres

* Use postgresql:9.5 since there's a problem with 9.6 (possibly an incompatibility with the driver version installed by libpostgresql-jdbc-java)

* Removed leftover

* Added posgtreql variants (not working yet)

* More progress, still not working. I have an issue with "jdbc:postgresql://replacecontainer:5432/replacedatabase" not working and generating " Caused by: java.net.UnknownHostException: xwiki-postgres-db"
* Added ascii art in Dockerfile
* Renamed containers so that we can run several xwiki images on the same machine without conflict

* Use a better name for the property (thanks to Tianon)

* Use a better name for the property (thanks to Tianon)

* More progress, still not working

* Prepare the field by generifying the templates/build and docker files

Add gradle to .gitignore

 XDOCKER-10: Cannot change database name
* Add leftover that was forgotten

* Minor improvement

* Implement a simple Gradle build to generate the various versions/variants.

* Added missing env in the example compose file

 * FIxed missing modification from past commit

XDOCKER-11: Stop using Docker link feature (legacy/deprecated)
XDOCKER-12: xwiki image is not laucnhed as a deamonbut as interactive
XDOCKER-10: Cannot change database name

'Creating network "xwikimysqltomcat_bridge" with driver "bridge"'

[Misc] Improve doc (was committed as part of "XDOCKER-13: Add an image tag for XWiki 9.0 and publish on dockerhub" on the 9.x branch)

http://jira.xwiki.org/browse/XDOCKER-11

[Misc] Fix typo in docker-entrypoint.sh that prevented using a custom mysql user name + Removed unnecessary env variable at runtime

[Misc] Fix wrong VOLUME location issue introduced when I refactored the code to depend on the tomcat image instead of on debian jesse directly...

[Misc] Fix sample docker-compose example for using xwiki now that xwiki has an official image on dockerhub