test, config, eclipse...
- Added random edge selection in Toolkit in addition to random node selection.
- Changed the use of old iterators with the new for( Node: graph ) notation.
Minor updates in comments.
- Added the Toolkit.averageClusteringCoefficient(Graph) method that merely does the average CC of all nodes given by averageCoefficients(Graph).
Add new generator for testing : PointsOfInterestGenerator
Dijkstra.java : 
 - Modify the attribute name used in the edges so that several Dijkstra objects can run concurrently on the graph.
 - Modify the value returned by getShortestPath() when source==target. The returned value is now an empty path and not null.
Minor changes due to the removal old the “old” ui sub-package and the oldDisplay() method in gs-core.
Added a "betweenness centrality" algorithm and corrected Kruskal and Prim to compile without the old UI.
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Merge branch 'master' of git+ssh://github.com/graphstream/gs-algo

Conflicts:
	src/org/graphstream/algorithm/Kruskal.java
	src/org/graphstream/algorithm/Prim.java
Corrections due to the getEachNode/getNodeSet changes in Graph.
in Generator : nextElement() becomes nextEvents()
javadoc ...
delete .{classpath,project} files
update javadoc ...
update javadoc ...
update javadoc of generators ...
add a README
update javadoc ...
javadoc