Some camera functions seem broken in 2D

I was trying to zoom to lla `88, 0, 27e6` in 2D mode and neither of the below calls work (each on their own should accomplish the task.

_Doesn't work_

``` javascript
viewer.scene.camera.lookAt(Cesium.Cartesian3.fromDegrees(88, 0),
new Cesium.HeadingPitchRange(0, -Math.PI, 27e6));
viewer.scene.camera.lookAtTransform(Cesium.Matrix4.IDENTITY);
```

_Does the same thing as above (Doesn't work either)_

``` javascript
viewer.scene.camera.setView({
position : Cesium.Cartesian3.fromDegrees(88, 0, 27e6),
heading : 0,
pitch : -Math.PI,
roll : 0
});
```

Reproduce the issue in 2D mode using the shown camera.lookAt, lookAtTransform, and setView calls with the 88, 0, 27e6 target. Start by comparing how these camera entry points handle 2D positioning and confirm the failure consistently. Done means the calls zoom to the requested longitude, latitude, and height in 2D mode.

Written by the indexing model from the issue text.