updated mu developer information
upgrade to 2.0.0-beta28 in ui and realtransforms
bump imglib2.version to 2.0.2
Simplify pom-imglib2 by extending pom-imagej

This inherits the shared configuration of pom-imagej, including
managed versions of the imagej, imglib2 and scifio organizations.

For details of the decision making progress which led to this, see:
http://imagej.net/pipermail/imagej-devel/2014-October/002280.html