ParamsWrapper only wrap the accessible attributes when they were set

[jfturcot]

In ActiveRecord models, the wrapped parameters are only the ones returned by attribute_names but this breaks nested attributes.

It now checks if attr_accessible was set on that model and wrap those instead if it was. We could just manually use the include option to list all the parameters that can be wrapped, but with this modification, we do not need to duplicate this code if attr_accessible was already set.

[josevalim]

Also, could you please add an entry to the CHANGELOG as well, saying you changed params wrapper to consider accessible_attributes which allows nested attributes support? Thanks!

[jfturcot]

I'm not sure if this is where you wanted me to add it to the changelog, this is my first pull request to Rails. Please let me know if I need to put that somewhere else. Thanks a lot!

[josevalim]

We usually add them at the top of the CHANGELOG but this way is great. Congratulations on your first contribuition. :)