demo(timepicker): update to angular 1.2.x

There is no need anymore to wrap the `timepicker` into a div since in angular 1.2.x there is no problem with the isolate scope leaking.

Otoh, I found no need on the inline style (I checked it on the demo and was as good as ever).

The other demo remaining is the `datepicker` one but @bekos took care already on his refactor.