Updates to CSS and Layout.

Added Trash Can button
Merge branch 'master' of https://github.com/halitanildonmez/DD2641_Lab2
Merge branch 'master' of https://github.com/halitanildonmez/DD2641_Lab2
Merge branch 'master' of https://github.com/halitanildonmez/DD2641_Lab2
Merge branch 'master' of https://github.com/halitanildonmez/DD2641_Lab2
Updates to Model

Model now reflects more JavaFX style model.  Where properties are used more pervasively with appropiate bindings.