* enum samples for bael6145 implementing toString() for enums
* updates from code review:
FastFood1: return empty string instead of null when no matching enum found
FastFood3: make enum name variable final
* make member variable private final in FastFoot3 enum
remove trailing comma in FastFoot2 enum
* Initial impl of enum
* Added Java 8 based enum searcher and test for it.
* Moved code to core-java-enums
* Fixed test name and readme
* Reused existing module core-java-modules/core-java-lang-oop-types-2 instead of creating a new one.
* Reused existing module core-java-modules/core-java-lang-oop-types-2 instead of creating a new one.