* generate a RestResourceRoot with a string constant holding the jax-rs resource root to be used in the @ApplicationPath annotation to make it easier for people, who want to write their own jax-rs Application class
* build and update samples as per PR guide
* renamed introduced constant from ROOT to APPLICATION_PATH to make its use more obvious
* remove import mapping logic in model generation, better handle of file, list
* add new files for file, list
* fix some tests
* update tests, doc
* skip file as reserved word in feign client
* add new files
* remove file from reserved word list in spring generator