FINALLY, we can draw some line while we are creating an edge!!!
It was the miscalculation (conversion between screen coordinate
and world corrdinate)

Also, enhace the visual feedback of selected edge.
Added comments, name of author.
structuring/putting jar
and adding build script. (super simple)
added final binary just in case things go wrong.
Merge pull request #25 from karpark/MoreUIWorks5

More ui works5