Also add docs for filtering output

Add to documentation

Adds a Marshaller class that can store errors

Correct parameter types for Nested field in docs

Also rename base_fields -> declared_fields

And some docs updates

by passing format to DateTime constructor

Conflicts:
marshmallow/__init__.py
marshmallow/core.py
marshmallow/utils.py
tests/test_marsh...

Also rename core.py -> serializer.py

And update changelog and docs

And make tests more backwards-compatible with py26

Also, change version to 0.2.0-dev

And fix invoke test command

and minor docs updates

Due to different behavior of local time between OS's.
Not sure how to fix this yet.

As well as to_marshallable_type

Can't use include in Github

Raw::get_value
Move MarshallingException to exceptions.py
Make helper methods private

Field classes are the preferred way to create custom fields

not working for nested serializers

More docs
And remove unnecessary marshal class method

In the style of ORM/ODMs and forms