added testdata
added FetchDataItem struct to encapsulate the DataItems portion of a fetch request
moved fetch reply serialization to  general place
changed signature of Fetch() to take a channel of Messages rather than returning a slice, also disambiguated some of the Maildir calls
cleanup and refactor
added a generalized imap response serializer
temporary hacks to parse fetch requests -- this needs to be replaced with proper processing
removed meta file, it is regenerated on demand