Allow optional URL host and schemes fields. (#221)
Allow optional URL host and schemes fields. (#221)

* Allow optional URL host and schemes fields.

* Strip trailing colon from URL scheme.

* Change from using URL class WHATWG API to the legacy API in hopes of passing Karma tests.

LucyBot-Inc/api-spec-converter,lucybot/api-spec-converter,lucybot/api-spec-converter,LucyBot-Inc/api-spec-converter,LucyBot-Inc/api-spec-converter,lucybot/api-spec-converter