Add all build artifacts to gitignore
Add all build artifacts to gitignore

erikvold/universal-react-boilerplate,gacosta89/knightsTour,davecarter/universal-react-boilerplate,cloverfield-tools/universal-react-boilerplate,topogigiovanni/universal-react-boilerplate,vasco3/universal-react-boilerplate,steveoliver/universal-react-boilerplate,ericelliott/universal-react-boilerplate,vasco3/universal-react-boilerplate,jmm/universal-react-boilerplate,cloverfield-tools/universal-react-boilerplate,gacosta89/knightsTour,ericelliott/universal-react-boilerplate