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
Merge pull request #20 from halitanildonmez/newhalitbranch

edited the main.css
Updates to Model

Model now reflects more JavaFX style model.  Where properties are used more pervasively with appropiate bindings.
Merge branch 'master' of https://github.com/halitanildonmez/DD2641_Lab2 into mhotan
Merge pull request #21 from halitanildonmez/mhotan

Updated Model
edited the main.css

added the panel for drag and drop
Merge branch 'master' of https://github.com/halitanildonmez/DD2641_Lab2 into halitbranch