CardReader functionality

Adding functionality and tests for Card Reader.
UploadCardRequest, CardReaderViewRequest, and CardReaderViewAllRequest are probably the big ones to review functionally.
Also tweaked headers to use API key unless the access token is present. Let me know if any part of the functionality is disagreeable- shouldnt be too hard to change
@Skiggz @McManCSU @bvanberg @Xorlev 

What about Retrofit's request interceptors?