0.6.0 release

• Initial Java Agent support, kudos to Turo Soisenniemi (@soisetu)!
  o use -javaagent:/path/to/javafxlibrary-0.6.0.jar=8270 in your favorite JavaFX application start command
  o use Launch JavaFx Application to initialize main class as traditionally
• New Is Java Agent keyword
• Set Screenshot Directory to have argument for log.html screenshot directory (fixes #17)
• Fix docker-compose up failure (fixes #41)
• Set Classpath to have warnings on failure by default and failIfNotFound argument.
• Removed unnecessary waitForFxEvents usage (speed improvements)
• Increased asyncFx thread usage internally
• Removed 12 deprecated keywords (enhancement #11):
  Find With Path, Find Class, Find All From Node, Find All With Pseudo Class, Find From Node, Get Node Children By Class Name, Get Node Height, Get Nodes Scene, Current Application, Node Should Be Invisible, Node Should Be Disabled, Window Should Be Showing