Size parameters not properly passed from file formatters to oEmbed requests

Had a bug reported during development that despite the height and width settings for a Youtube field, those values were not being respected at all.

This seems to be a bug in the Media: oEmbed module. It is making requests to the Youtube oembed provider in the form of:

Request:

http://www.youtube.com/oembed?width=840&height=510&wmode=direct&url=http://www.youtube.com/watch?v=8uDuls5TyNE

Response:

{
provider_url: "http://www.youtube.com/",
thumbnail_url: "http://i1.ytimg.com/vi/8uDuls5TyNE/hqdefault.jpg",
title: "Maru Greatest Hits V1",
html: "<iframe width="459" height="344" src="http://www.youtube.com/embed/8uDuls5TyNE?fs=1&feature=oembed" frameborder="0" allowfullscreen></iframe>",
author_name: "ecinajx19",
height: 344,
thumbnail_width: 480,
width: 459,
version: "1.0",
author_url: "http://www.youtube.com/user/ecinajx19",
provider_name: "YouTube",
type: "video",
thumbnail_height: 360
}

Note the 'width' and 'height' parameters are the expected values that are set in the file formatter settings. But the repsonse we're getting from Youtube does not respect these, because it shouldn't. The oEmbed specification says requests should be using 'maxwidth' and 'maxheight' for parameters. And indeed the response with those changed parameters includes a much different response:

Request:

http://www.youtube.com/oembed?maxwidth=840&maxheight=510&wmode=direct&url=http://www.youtube.com/watch?v=8uDuls5TyNE

Response:

{
provider_url: "http://www.youtube.com/",
thumbnail_url: "http://i1.ytimg.com/vi/8uDuls5TyNE/hqdefault.jpg",
title: "Maru Greatest Hits V1",
html: "<iframe width="680" height="510" src="http://www.youtube.com/embed/8uDuls5TyNE?fs=1&feature=oembed" frameborder="0" allowfullscreen></iframe>",
author_name: "ecinajx19",
height: 510,
thumbnail_width: 480,
width: 680,
version: "1.0",
author_url: "http://www.youtube.com/user/ecinajx19",
provider_name: "YouTube",
type: "video",
thumbnail_height: 360
}

This seems to be complicated in that embedly seems to "support" height and width being used, but the native oEmbed implementations do not. We should ensure that these parameters are being passed correctly.