Region crop for absolute values

[danielpes]

If there is a defined region with any size, and a media is associated to this region but with a new absolute size (defined by property tags) bigger than the parent region, the player does not crop the media to the size of the parent region (even if the parent region has the same size of the canvas!).

Example: http://pastebin.com/LVbM5CN6

Even though the Ginga-NCL player does crop the media in this case (the blue jpg is shown with the size of 'parent' region, which is 90% of the canvas size), we decided to keep the media with the size defined by the user, since it is an absolute value.

Suggestion: show a warning when the user choose a size for a media that is bigger than the parent region of the region referred by the media.