Two new citations

[Boudewijn Rempt]

I've added two citations to the Krita page on the KOffice website -- one
for a project that has existed for some time and is very inspirational
(especially the video): dAb (http://www.cs.unc.edu/Research/geom/dab/),
and a new project by the same people they are going to present in Annecy
next week: IMPaSTo (http://gamma.cs.unc.edu/impasto/). This is really,
really cool stuff: I only wish they would make their source code available...