handle binary types, needed code generator to recognize the binary flag on string types, and protocols to have separate methods to read/write byte arrays.
generate strings as utf8, as the spec indicates such.
read/write methods instantiate types for complex types based on the metadata supplied, instead of trying to guess type from the serialized data and failing
split runtests.jl into generate, client and server parts
use fieldtype. don't need fld_typ anymore are we support only Julia v0.4 onwards
runtests.jlinto generate, client and server partsfieldtype. don't needfld_typanymore are we support only Julia v0.4 onwards