First version of Spargel for the new Java API.
Equality/hashing for some type infos.
Comments on iteration runtime context.
Renamed spargel iteration classes (more intuitive names) and added all java docs.
Made edge iterators iterable.
Added page rank example to spargel
First part of integrating delta iterations with new java api's optimizer post pass.
Delta Iterations for new Java API; SimpleDeltaPageRank + testcase
Fixed bug in splitting logic of number sequence iterator.
Fixed import lost during merge.
Fixed erroneous propagation of messages for Spargel.
SpargelConnectedComponentsITCase properly verifies results.
Changed members of Costs to double, cumulative cost is now the node cost plus the costs of the children divided by their out degree