* Sets dist/os to the defaults
* Does not check for branch is master and a tag since these will never be true
* Removes on: tags=true
* Removes deprecated: sudo: required
* Replaces deprecated `api_token` with `token`
* Uses unique names so travis doesn't warn

Fix CI to only release docker tags on master branch

Fixes the build error in pull request #119 and also prevent release tags that are not also commited on the master branch.

Creates a docker tagged image for jetty and tomcat

This reverts commit fffa6923.

Tags the docker image if there is a git tag

New servlet to expose the language tokens of the PlantUML engine

Same as `java -jar plantum.jar -language`, a new servlet is added to
expose the tokens supported by the current version of the PlantUML engine.
Useful to support tools relying on a running PlantUML server to support
syntax highlight.

Added support for Authorization header

Custom BaseURL using docker-compose