add afc_group as editor for ArchiveItAccw collection.

Update examples to test for correct editor groups.
Specify editor in ArchiveItAccw resource set.
clean up white space

Clean up extraneous whitespace on one line of oai_dc_http_reader.rb
Add spaces around << operator in oai_dc_http_reader.rb to visually distinguish
  append operation from "here document" declaration.