`loadUrl` enhancements
- Make `options` parameter optional
- Allow partial overriding of instance options when calling `loadUrl` directly
- Make `requestOptions` optional
- Document `loadUrl` usage and provide examples
* Lots of code cleanup
* Cleanup parse-options tests
- Rename objects for clarity and inline unneeded objects
- Remove unneeded tests
- Use Object.keys().length instead of a custom function
- Use typeof === "object" instead of a custom function that checks the prototype tree as well, since we don't expect anything but an object literal.
* Remove old switchFallback code
* Remove polyfill for Function.prototype.bind
* Inline small functions
* Add more documentation and tests for options.currentUrlFullReload
Closes#17
* Update package.json
