Update tutorials to work with latest SCIFIO code

The main idea is to switch to io.scif:ome-formats for the OME-XML
support.

Unfortunately, because ome-formats has not yet been released, we must
use a SNAPSHOT dependency coupling. I justify this by the fact that
previously, the SCIFIO Tutorials had a SNAPSHOT dependency coupling on
pom-scifio:0.4.1-SNAPSHOT anyway, which differed from the actual parent
in the reactor (i.e., the versions were out of sync). So the tutorials
build was already hosed up. With that in mind, and because SCIFIO 0.6.0
has problems creating limited contexts (around SCIFIOService
descendants; see fcd27afe70732038b1ca7122744315b09e372c48), the
io.scif:scifio dependency is also set to 0.6.1-SNAPSHOT for now.

Of course, we want to move away from SNAPSHOT couplings ASAP. But that
will necessitate some cleanup of io.scif:ome-formats and a subsequent
release first. Ultimately, we also want to split out the tutorials to
their own repository.

Lastly, note that io.scif:ome-formats currently has no Jenkins job which
builds it automatically. So I manually deployed a SNAPSHOT build just
now to keep the SCIFIO tutorials builds happy.