FNNDSC/ami

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### Description
<!-- Example: Error thrown when loading file XXX -->

#### Live Demo
<!-- Fork this JSFiddle, or provide your own URL -->
http://jsfiddle.net/gh/get/library/pure/fnndsc/ami/tree/master/lessons/01#run

#### Steps to Reproduce
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Example:

1. Load data XXX
2. Visualize with stack helper
3. Change window level
-->


#### Expected Results
<!-- Example: Nothing changes -->

#### Actual Results
<!-- Example: The window level should change -->

### Browsers Affected
- [ ] All
- [ ] Chrome
- [ ] Firefox
- [ ] Edge
- [ ] Safari 9
- [ ] Safari 8
- [ ] IE 11

### Versions
- AMI: vX.X.X
- THREEJS: vX.X.X