Shrink WASM size, add privacy notice, add bounding box demo

This release includes modifications which shrink the size of the generated WebAssembly binary, adds a notice about the app's privacy policy, and adds a small bounding box demo based on Paul Irish's multi-touch work. (See the README for attribution.)

The privacy policy is stated when you land at the app's front page. Put simply, all images and video handled by this app will stay local to the device, and will never be transmitted to third party services.

This is an educational demo app, and we have no desire to engage in marketing pursuits. The backbone of this app is tensorflow.js, a product released by Google. Our understanding is that tensorflow.js is limited in scope and won't spy on anyone. Most of the work contained within this project consists of simple user interface controls which allow the object recognition algorithm to be run on pics captured by the user.