Added Styles and Logic for helper tool

First pass…
First Draft Ready!

*   Added lots of comments
*   Included GreenSock’s GSAP animation engine to tween between focus
points
*   Style tweaks
*   Added target reticle to GUI - fought urge to make it look like
holographic reflex sight reticle
*   Added new image (one without the reticle on it - courtesy of
Unsplash.com)
*  Tested in Chrome, Firefox and Safari… that’s all I have with me.
Removed rounding on values for smoother animation.
Removed GSAP, added CSS Transitions instead
Changed Animation ease function

ease-in-out makes transitions of focus point look nicer
A few last tweaks

Transitions, clean up JS (removed commented out GSAP stuff)
Merge pull request #15 from auginator/helper-tool

Vastly improved helper tool courtesy of @auginator