blob-2.0.5-pre2 development snapshot

As allways, the blob team is still in the middle of lots of code
cleanups for new features, but we thought it was time to release a
development snapshot. We're still not near a major release, but the
current codebase works pretty well for a work in progress so we'd like
to release it today as blob-2.0.5-pre2.

If you meet any problems, don't hesitate to write to the LART mailing
list (see http://www.lart.tudelft.nl/list/\), or join the #blob IRC
channel on irc.openprojects.net.