Interactions option not respected

Without this change, the `interactions` property is renamed on map options (see #1210).  The following examples demonstrate the problem:

 * http://ol3js.org/en/master/examples/drag-rotate-and-zoom.html
 * http://ol3js.org/en/master/examples/full-screen-drag-rotate-and-zoom.html
 * http://ol3js.org/en/master/examples/select-features.html