WIP: Misc fixes

[mittsh]

WIP

• [x] Update to Node 8.11.3 (LTS)
• [x] Fix loading of PostmanV2Parser for Node.js
• [x] Fix Paw Parser when a DynamicString is undefined
• [x] Fix undefined protocol bug (notably breaks the Postman 2.0 Importer)
• [ ] Fix the API Flow CLI
• [ ] Clean up Webpack configs