React Native support

[ksaaskil]

• Unmock depends on Node.js libraries via, for example, json-schema-ref-parser
• These dependencies should be removed to have Unmock run on device when doing React Native development
• See https://github.com/unmock/unmock-react-native-example/pull/3

[ksaaskil]

Closed by https://github.com/unmock/unmock-js/pull/360, https://github.com/unmock/unmock-js/pull/359. As a happy coincidence also enabled using Unmock in browser https://github.com/unmock/unmock-examples/pull/30