protocol/_base: Handle EnumBase
protocol/dictdoc: Use correct body class
protocol/msgpack: Fix MessagePackRpc
minor docstring update
minor
app reinit moved to server init
update six to 1.7.3
make appinit optional for null server
object xml handles none values correctly
minor
add pretty print option to spyne.model.complex.xml
minor
add html support to xml document
add Deferred safeguard, just in case.
make twisted http transport handle body_style=bare
add AnyHtml support to to_cloth
don't complain that loudly about empty html documents.
when generating complex types from an lxml element, inspect for xsi:type attribute so that appropriate subclass complex objects will be instantiated rather than base class objects

basically, attempt to honor polymorphism
minor
python3 tweak. #113