Encode $select, $filter, ... in body when using ajax-post extention

[art-ist]

When dynamically building breeze queries (I use the breeze JSON syntax), especially when using the great capability to use navigation properties, queries can get quite long. This in my view is the more common breeze-way issue than manually adding big parameters.
Unfortunately when using the ajax-post extension, only the withParameters-parameters are sent in the message body. The $filter, $select, ... parameters are still sent in the querystring, which tends to get too long.