code: function convertBreakpointsToEm(breakpointsInPx) {
      var breakpointsInEm = {};
      var breakpointNames = Object.keys(breakpointsInPx);
      breakpointNames.forEach(function (breakpointName) {
          breakpointsInEm[breakpointName] = px2em(breakpointsInPx[breakpointName]);
      });
      return breakpointsInEm;
  }
docs: Converts the given pixel breakpoint object into a em breakpoint object