test(timepicker): add tests for keyboard selection
fix(timepicker): keep correct time part selection when using keyboard to select time

When the key press handling changes the time value, we need to recalculate the position of the date parts to select after updating the time value.
fix(affix): revert to $affix reference in $onResize event handler

The affix $onResize event handler was throwing an error when using 'this' to refer to $affix
docs(tab): switch SASS with LESS reference
docs(hacking): add note regarding bower install