Support URL object for fetch and fix getBaseUrl

[akkadaska]

A solution for #140.

Fixed request.js to support URL object for fetch.

• Changed to convert URL object to string when the input variable is an instance of URL object.

Fixed getBaseUrl() function in url.js to support fetch URL that has no host for any environment.

• Changed to return an url whose origin is the same as the url where the storybook is hosted (= location.href) if the url has no host.
• To test a function that refers to window.location.href, set Jest test environment to jsdom and add mock of window.location.href``.

Note : new URL(url, base) returns url without changing anything if it has host.
e.g. new URL('https://a.com/foo/bar', 'https://b.com') -> https://a.com/foo/bar

[nutboltu]

@akkadaska can you resolve your merge conflicts?

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[akkadaska]

@nutboltu
Merge conflicts have been successfully resolved. However, tests are failing, which seems to be a pre-existing issue with the master branch.