missed checkin
gitignore for cleaner git-status
first commit with submodule json-java from https://github.com/chickenandpork/JSON-java.git cloned from https://github.com/douglascrockford/JSON-java
add json-java as subproject vs jackson JSON libraries as remote prebuilt; configure-time chosen as alternatives built into vw4tools jar
since json-java does not build outta-the-box, switching to Jackson library for JSON parsing as default option