turned on highlight events for hotspots
Fill property on sketch config, update to lite method on imageviewer

* fill property on shape objects, althought it should probably move down to individual data
this allows objects to be clicked on in the center, but I haven't quite worked out the individual object classing and unclassing to allow hotspots to show properly
* imageviewer now updates the image to match the lit carousel, instead of calling a non-existant lite function for captioned images. we need to discuss the split between highlighting and selection on carousels.
Merge pull request #34 from jvish/review

Review
Update d3 to ver 3.1.9
Added Carousel unit tests.

Added itemKeyToIndex method on Carousel w/ tests.
renamed widget-lineGraph-spec.js to have a lowercase g.
Merge pull request #35 from mlippert/widget-refactor

Added Carousel unit tests and  updated d3