added draggable widget, sortable list widget, example for sortable widget in example-ofxUIAllWidgets
Fixed crash when adding an item if we jsut deleted the lastadded (lastAdded is invalid)
Changed lastAdded to a stack so we maintain a better layout when adding/removing elements
Fixed Text Input construction in addTextInput
Merge pull request #150 from JohnSebastianHussey/sortableList

added draggable widget, sortable list widget, example for sortable widge...
Merge pull request #159 from SoylentGraham/lastAdded-Stack

Changed lastAdded to a stack of elements so we don't lose our canvas positioning
Merge pull request #160 from SoylentGraham/TextInputFixes

Fixed Text Input construction in addTextInput