Remove bundledDependencies & committed node_modules from cordova-ios

As described in parent task CB-14241: now that next major "-dev" release is marked (cordova-ios@5.0.0-dev) and CB-14074 (remove Node.js 4 from cordova-ios package.json & CI) is committed it is time to:

• remove bundledDependencies entry from package.json
• remove the committed node_modules
• fix .gitignore to completely ignore node_modules