Fixed tile interface checking and generation.
Made blank tile accessable ONLY when there is no other possible tile.
Changed children to Collection<IWorldTree>
Moved comments to Interfaces
Added Driver
Moved Space to internal.space
Working on ui
Added change file
Partially completed UI
Moved changes file to root directory
Added antfile
Added init shell script
Erorr handling tweak in test engine.
Added empty Constraint class
Modified WorldTree to account for new Constraint class
Started work on parser
Parser suffers from left recursion
Merge branch 'gurupras@buffalo.edu' of https://github.com/okennedy/worldtree into okennedy@buffalo.edu
Fixed left recursion issues
Working on implementing all container classes
Modified parser name to Parser
Modified all container class fields to private
Moving towards completion of container classes
Moved all container classes to internal.containers