Added root() to IWorldTree
Implemented root() in WorldTree
Removed calls to TestEngine.write() from WorldTreeFactory
Call to this method is now made in the parser itself in direction()
Changed constructors for container classes to public
Fixed property parsing
Added custom toString method to most container classes
Removed static modifier from parsers
Renamed TestEngine to UIDebugEngine and updated references
Updated packages and references
Added JUnit4 library for UI debugging
Added partially completed test for parser