Add utility function for parsing iso8601 time strings
Implement deserialization for remaining fields

Also add Serializer#make_object method for creating an object with
the deserialized data
Add deserialize_from_json method
Fix tests on py26 and pypy
Bump dev version -> 1.0.0-dev
Improve str representation of _WrappingExceptions

Show type of underlying exception
Implement Nested deserialization
Use Field.attribute for the keys in deserialized result
Start deserialization docs
It's 2014
Revert __str__ of _WrappingException