Removes unused methods - v1 will be read only; no user auth
Adds Retrofit try-out method in ImgurClient.main - wip
Adds test for getting image using Retrofit
Moves ImgurApi to upper level, renames ImgurClient to Imgur
Applies succinctifications to test class asserts
Removes superfluous assignment
Reduces Imgur from implementing unrelated interface, choosing anonymous class instead
Adds specific error message for not-good HTTP status
Changes Imgur to return Image instead of ImageResponse
Fixes minor style issues
Merge pull request #6 from ataulm/retrofit

Retrofit