Image detail call modified 

Currently only four fields are listed in image detail command namely id, account id, name and global_identifier which are already listed in sl image list call.So this might make the sl image detail call redundant.
Added additional fields Notes, Tags, Status, capacity and size on disk which will give us more details regarding an image. https://github.com/softlayer/softlayer-python/issues/295
Also,this will help to confirm the sl image edit call. https://github.com/softlayer/softlayer-python/pull/306