Applying to the contact API too

[tttp]

So far, it was only used by the profile API. It works fine, but more and more usage are bypassing it and going directly to the contact api (hello webform_civicrm).

So let's apply the normalisation to the contact api too

[bkaless]

Could you estimate the work to do? Is the extension compatible with 4.6 and/or 4.7?