v1.0.0-beta02

-kotlin 1.3.72
-added multiple fields to models
-removed manual hashCode() and equals()
-unit testing for basic features
-added ability to reuse an external Retrofit singleton
-better handling of iterating through commentData structures
-added fetching wiki by page and revisions
-added error throw if wiki is disabled
-uniformed naming of fields (id, fullname...)
-added userless authentication
-simpliefied authentication with helpers objects
-started dokka documentation
-added multi subreddit fetching, by id
-moved self user call when needed inside client
-minors fixes