Undo returns to the original state, not the previous state

Undo returns to the original state, not the previous state. If i make two changes the first change is ignored.

Steps to reproduce:

1) Open the bSpace demo from the daily build site:
http://build.fluidproject.org/fluid/sample-code/inline-edit/section-info/section-info.html

2) Edit one of the inline edit fields, make sure to save it so the undo icon appears.

3) Re-edit the same inline edit field.

4) Pressing the undo/redo button will toggle between the original state and the last edit. It should toggle between the last and second last edits.

dev-iteration43