build commonjs and es6 modules

trained two new 68 point face landmark models from scratch, which are more accurate, much faster and much smaller in size

Merge branch 'master' of https://github.com/justadudewhohacks/face-api.js into train-landmark-models

just fixed some small typos

fixed landmark postprocessing + resize input canvases instead of tensors to net input size, which is much more performant

fixed landmark postprocessing + resize input canvases instead of tensors to net input size, which is much more performant