Using plain objects for selections instead of Model entities
Merge pull request #441 from anserran/master

Fixing format - @manuel-freire owes a beer round
Merge pull request #439 from anserran/selection

Using plain objects for selections instead of Model entities
Added save and bin icons.
Changed the save icon
Improved the tweens panel
Fixed some bugs, typo and junk code. Also added some documentation.
Merge pull request #425 from RotaruDan/TweenUI-improvements

Tween UI improvements