patch method should also catch IntegrityError
Removes unused helper function.
return all fields of the object when posting, nost just the id
Updates documentation to reflect new POST response.
requirements.txt needs python-dateutil less than 2.0

The requirements.txt file should require the packages necessary to install
Flask-Restless regardless of platform. The setup.py file should be smarter
and require only the necessary platform-dependent packages.
check all parent classes for hybrid properties

In order to find all hybrid properties, the code must look through all base classes. This is because the object of type `hybrid_property` is only visible in the `__dict__` of the base class where it was defined, and not in derived classes. Without this, if you have a `hybrid_property` defined in a base class (perhaps one containing several common columns and a property calculation that you'll need on more than one table) then this code wouldn't find that `hybrid_property` to show it in the API.

For more on `hybrid_property`, see also pull request #138.
Merge pull request #156 from glyphobet/hybrid-properties-on-base-classes

check all parent classes for hybrid properties
add AssociationProxy support

issue #148
Simplifies tests for association proxies and applies style fixes.
Fixes code style.
Notes fix for #148 due to previous commits.
Merge pull request #160 from bjourne/fix-crash-on-patch

PATCH method should also catch IntegrityError
Merge branch 'master' of git://github.com/jfinkels/flask-restless