Added test to see if a dict containing integers can be properly converted to an etree.

This is needed because AnyDict can be assigned plain integers instead of a list of integers.
Added test for non complex value in root dict.
Test the cases where the value is None.
Enable use of AnyDict with values that are not collections.Sized (eg. they've got no __len__ method).
Do not convert strings into an array of characters.
use rpc instead of srpc in examples.
add support for decoding non-ascii data in http requests.
remove unused var.
minor
add comment for str decode hack
Quickfix for https://github.com/arskom/spyne/issues/272
Fixed import error
Customized primitive types were in default XMLSchema namespace
Merge remote-tracking branch 'arskom/master'
Couldn't override nillable flag globally
Class-level __nullable wasn't reliable against ocasional instance update
Test of nullable default customization
added helloworld example for the NullServer.
support indexing of implicit fk values.
add add() method to odict.