Add comment to blog code

Merge pull request #2 from cpury/tfjs-1-5

Fix performance issue: Be smarter about retrieving image array

Reduce calls to sync() methods

Update TFJS to latest version

Add nodemodules to .gitignore

Update README.md

Update code to use latest tfjs 1.1

Update tfjs to 1.1 in blogcode

Improve blog code and tutorial messages

Add function to render filter to canvas

Use let/const instead of var

Update README with link to blog post

Format all js files with prettier / eslint

Reformat blog code