More maintenance

[YashdalfTheGray]

• added hubot-hello so hubot will say hi
• cleaned up the package.json file and added a package-lock.json
• added eslint for linting the javascript and a npm run linter command to lint the entire project
• added an .eslintignore file so that node_modules and bin aren't linted
• changed editorconfig indent for json and yaml to 2 spaces.