swift-sim: add support for limit in listObjects
e2e: allow select to lookup multiple properties
swift-sim: sort subdirs correctly
swift-sim: add support for marker in listObjects
container: load objects incrementally (fixes #159, fixes #160)

Loading the entire container listing with a single GET makes the UI
freeze when the objects are inserted in the table. We now load the
object names in small chunks instead and this gives a much more
responsive application. The time to seeing the first object is also
much improved since we can quickly insert the first chunk.

This also ensures that we can handle containers with more than 10k
objects. Swift will be default not return more than 10k results for a
single GET, and the code can now handle this.
container: load objects in bigger and bigger chunks

This saves some round-trips to the server. By starting with a small
limit of 8, we get a quick response and can then fire off a query for
the next chunk of 16 objects.

We limit the chunk size to 128 since this seems to be the size where
the transfer and processing time becomes a problem again.
Merge pull request #189 from mgeisler/chunked-list-objects

List objects in chunks