- set `ALLOW_PLANTUML_INCLUDE` only once and decentralized inside the `DiagramResponse` class and call this init method after initializing the server
- set `PLANTUML_SECURITY_PROFILE` to `INTERNET` by default (BREAKING CHANGES)
- add possibility to set PlantUML system properties over a file with `PLANTUML_PROPERTY_FILE`
- adjust documentation
- add "Breaking changes" hint to README
Improved unit tests to be independent of externally running servlet container, now every test runs its own embedded jetty server (and stops it afterward).
Removed all eclipse artifacts (.project, .classpath, .settings, etc.) and added to .gitignore to be independent of development environment (can be autogenerated by maven, or better yet use m2eclipse).
Removed embedded dependency jars since they are handled automatically by maven.