add image rotation based on exif data

[Petr Nejedly]

http://forum.serviio.org/viewtopic.php?f=3&t=89

should be per profile, because some devices might do it themselves

[Petr Nejedly]

this should be done as part of transcoding, similar to #25

[Petr Nejedly]

this should also deal with rotating thumbnails (for all profiles, when creating the thumbnail)

[Petr Nejedly]

Removing version: 0.4 (automated comment)