Show error messages to end user

[jessieay]

Was having an issue where my API key was always returning false

@client.get_vendor_summary(duns: '1234567')
=> {:in_sam=>false, :small_business=>false}

this would happen for any duns number.

when I went deeper and ran this:

HTTPClient.new.get Samwise::Protocol.duns_url(duns: '1234567', api_key: MY_API_KEY)
=> #<HTTP::Message:0x00564c5c248ea8 @http_header=#<HTTP::Message::Headers:0x00564c5c248e30 @http_version="1.1", @body_size=0, @chunked=false, @request_method="GET", @request_uri=#<Addressable::URI:0x2b262e124f74 URI:https://api.data.gov/sam/v4/registrations/1234567?api_key=MGPzhnEylwtQAjZYBx5pFIq02C9JPSSAe4uKzRIN>, @request_query=nil, @request_absolute_uri=nil, @status_code=403, @reason_phrase="Forbidden", @body_type=nil, @body_charset=nil, @body_date=nil, @body_encoding=#<Encoding:ASCII-8BIT>, @is_request=false, @header_item=[["Server", "openresty"], ["Date", "Fri, 16 Sep 2016 18:29:58 GMT"], ["Content-Type", "application/json"], ["Transfer-Encoding", "chunked"], ["Connection", "keep-alive"], ["Vary", "Accept-Encoding"], ["Access-Control-Allow-Origin", "*"], ["X-Cache", "MISS"]], @dumped=false>, @peer_cert=#<OpenSSL::X509::Certificate: subject=#<OpenSSL::X509::Name:0x00564c5c1ee4d0>, issuer=#<OpenSSL::X509::Name:0x00564c5c1ee4f8>, serial=#<OpenSSL::BN:0x00564c5c1ee520>, not_before=2016-08-01 00:37:00 UTC, not_after=2016-10-30 00:37:00 UTC>, @http_body=#<HTTP::Message::Body:0x00564c5c248cf0 @body="{\n  \"error\": {\n    \"code\": \"API_KEY_DISABLED\",\n    \"message\": \"The api_key supplied has been disabled. Contact us at https://api.data.gov/contact/ for assistance\"\n  }\n}", @size=0, @positions=nil, @chunk_size=nil>, @previous=nil>

we should filter this error message up to the end user rather than returning false