can create non-virtual directories through pickle again
User can import detected sub-directories (JS)
spec: creating Directory
Directory creation except intermediate dirs
upgrade rails to 3.2.12, upgrade pry
Hack around rails misbehaviour: ignoring :unless opt in after_save callback
default Directory#virtual? to true
create intermediate Directores by given (relative_)path

 * tarzan through Directory only with local variables to not confuse ancestry
 * use blank_directory factory for parents
 * simulate mkdir -p
 * generate and store Directory#relative_path
 * s/path/full_path/
 * store the relative_path
 * spec Directory.by_relative_path
 * circumvent ancestry for creating children
 * order is important
 * giving name is not neccessary when giving relative_path
 * must find or create directory by basename (used on disk, uniqueness)
 * maintenance: properly create sub Directories
really create directories from Ember
give bonus on inclusion of one name in other for auto-targeting Move
autodetection of subdirectories works again
Can import root directories
there is still a lot TODO