fix(webviewShared.js): Support all valid URI schemes and add testing (#293)
* Change origin whitelist to allow for all valid URIs
- Now supports +, -, and .
- Prevent whitelist from matching when preceded by unwanted characters
- URI must begin with letter
- URI Scheme syntax: https://tools.ietf.org/html/rfc3986#section-3.1
* Add jest testing framework and run it on CI
* Add tests for WebViewShared's createOnShouldStartLoadWithRequest