Updated Transaction Upload API (markdown)

Transaction-Upload-API.md

@@ -1,12 +1,12 @@
 # Transaction Upload API
 
-_Last Updated 2017-04-20_
+_Last Updated 2017-04-22_
 
 ## `POST /api/upload`
 
 Takes a `multipart/form-data` upload, with the following parts:
 
-* File under the form key `file`
+* File under the form key `file` with the content type `image/jpeg`
 * JSON Object with required arguments under `json` key
 
 The JSON can be one of the following types:
@@ -76,6 +76,7 @@ If something is missing from the request, or is invalid, you will get a response
 {
   success : false,
   message : <error message>
+  error : <error type>
 }
 ```
 
@@ -85,6 +86,7 @@ If there was a server error, you will get a `500 SERVER ERROR` and possibly the
 {
   success : false,
   message : 'An unknown error occurred when adding the transaction'
+  error : 'server_error'
 }
 ```