commands: wrap grunt commands with NPM scripts
commands: wrap grunt commands with NPM scripts

"grunt" command was supposed to be installed
globally to be able to run commands like `grunt
eslint`. With npx `grunt eslint` can be replaced
by `npx grunt eslint` to use local grunt command
line client.
For standardization purpose all commands are now
wrapped into NPM scripts commands. `grunt` global
installation is not needed anymore and commands
are run using NPM scripts like `npm run lint`.

veo-labs/openveo-rest-nodejs-client