add trove4j for int array list
plot list of points in one call
remove IntArray impl in mesh/voronoi source
switch to trove's TIntArrayList vice custom IntArray impl
fix a bug in processing empty regions
simple centroid computation and empty check
do centroid computations in a thread pool. based on actual density function based on brightness of underlying image for an arbitrary closed polygon
Merge pull request #10 from measures/stippling

Stippling