Removes all references to yarn and switches to npm for all package installs, scripts, and documentation.
Adds react@15.3.2 to remove eslint warning. React has been added as a devDependency since it
is not bundled via node_modules and only used for linting.
Validation
[x] rm -rf node_modules && npm i
[x] start the server and ensure that all examples work as intended
Changes
Validation
rm -rf node_modules && npm icloses #93