Zoom bug fixes

Fixes the following bugs:

• Now loads elevate zoom on the first slide.
• Fixes a critical bug with the image size checker
• Fixes disappearing elevateZoom object, now making keyboard zoom work all the time.

Initial Release

This release has the default intended functionality:

Use a Flexslider based image slider for product images on the PDP
When viewing a configurable swatch, the slider collection will repopulate with all the children product's images when the corresponding color swatch is selected.
Supports Magento's elevateZoom
For accessability, tabbing to the image and pressing enter will let the use move the zoom lens with the keyboard. Pressing escape will return the fuctionality to flexlider.