Strong_parameters support

[kibs]

I am having a bit of trouble getting nested_form working with strong_paramters.

nested_form adds a "new" to the autogenerated ID, see #21 but strong_parameters only supports nested attributes keys containg only numeric values negative or positive numbers.

I have created a pull request adding a failed test to strong parameters rails/strong_parameters#40 but i would like to hear your opinion regarding this matter. I would think it is quite difficult getting strong_parameters working with "new"

[lest]

Fixed in d742482111a469df87f937904192ef8a4ceb21e1. Thanks!

[kibs]

Actually looking into why the new_ was added in the first place #21
I am not sure removing new_ is a good idea

[lest]

fields_for doesn't use id field as key. It uses auto-incremental number started from 0. So conflict may occur only on rendering a form with million of nested fields.

Maybe at the time of #21 there was a different behavior but now it's not required to add new_ prefix.

[kibs]

ahh okay! makes sense! Thanks for fixing this