PolyDiskTree accepts root directories
to PolyDiskDirectories with distinct alternatives
inserting root children
deep insertion works
extract PolyDiskDirectory in own file
can specify PolyDiskTree#directories on creation
follow namingConvention
poly root directories shown
update ember and active_attr
list subpolydirs
forward exists from poly to alternatives
use new link-to and quote route names
combine ids of Directories to filter
filter multiple directories at once
order children by name, alternatives by id
remove debugging
TODO
notify filter of finished Emu request

Problem was: torrents.reaload() was coming back too late for
polycontroller changes to take effec ton page load, but worked when
following link.

We want promises!
must set controller#content manually (#model is not set either)
update ember-emu