Updated HttpTransportContext and HttpMethodContext to be easily overrideable.
Implemented TwistedHttpMethodContext and TwistedHttpTransportContext to enable properly setting Content-Type HTTP header as necessary.
Couldn't create complex model without defined _type_info
Add mapper for Django models
Easy way to convert complex model to dict
Tests for model rpc service
Pass pattern strings instead of compiled regexes
Strip metachars, check has_default
Django uses 32 bit integers by default
Support field list to exclude from mapping
Unknown fields check
Each mapper instance has own registry
strip_metachars -> strip_regex_metachars

Consistent String usage
Tutorial and doc fixes for Django integration
some harmless maintenance to the dictdoc shared test suite.
add child freq validation test.
some more harmless changes for the http test.
clean up and add docstring to protocol.dictdoc._fill
check_freq_dict => _check_freq_dict, moved validate_freq test outside.
added http validation tests.