Large file uploads can cause HTTP error 0

A bit of extra config is necessary for nginx to handle files larger than 1mb,

It's probably worth putting a note about this into the setup instructions for this module, just in case anyone else, like me, wasn't aware of this.

  #Fix for error 413 request entity too large for files > 1MB
  #In Drupal seen as http error 0 when trying to upload file
  client_max_body_size 500M;  # or whatever max file upload size you need
  client_body_buffer_size 128k;