#33 byte array value support

[Mark Lentczner]

read 'em, write 'em

The schema for it needs to be defined as well. Is it base64
encoded? Is the encoding fixed or specified?

[Mark Lentczner]

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Now that the mime type issue has been solved without changing
FileMedia, this task can be postponed until the FileMedia mime
type task is scheduled.

[Mark Lentczner]

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still need to add more tests for ByteArray in tempmedia-test.cpp
(check for all tests with strings and make sure there are
matching tests for byte arrays)

XMLWriter needs to support ByteArrays

no encoding support in either XMLReader or XMLWriter