Returning to a selected year resets selected month

See the docs example: http://codepen.io/simeg/pen/apQLdd

* select a month
* view a different year
* return to the previous year
It should display the previous selected month however **month has been reset to either january or december**

If returning to selected year via year selection view then selected month is reset to **january**
If using the arrow button in the header it is reset to **december**