Removed the current models
Created the abstract model
Changed the entire model organization

The base model is Transmission\Torrent now which
extends from Transmission\Model\Torrent. This way,
all the static methods are neatly organized in the
base torrent model (Transmission\Torrent) while the
actual representation is done by the actual model
(Transmission\Model\Torrent). This has the adventage
that new fields are more easy to add since it doens't
make the entire model less easy to read.