v3.3.0

• Added ECMAScript 2017 support
• Added lerna to manage our packages
• Added contributing readme
• Added .nvmrc to promote node 8.7
• Updated travis build config and node version
• Upgraded eslint 4.18
• Upgraded eslint-plugin-import to 2.9
• Upgraded eslint-plugin-react to 7.7
• Added react/button-has-type rule
• Added react/no-this-in-sfc rule
• Added react/jsx-child-element-spacing rule
• Added react/jsx-max-depth rule
• Updated react/prefer-stateless-function to off
• Updated jsx-a11y/anchor-is-valid to off
• Updated react/jsx-key from error to warn
• Updated react/jsx-curly-brace-presence to off
• Updated react/jsx-no-bind from error to warn
• Updated react/jsx-filename-extension from error to warn and now expects .js
• Updated react/self-closing-comp from error to warn
• Updated react/no-array-index-key from error to warn
• Updated object-shorthand from error to off