changed signature of optimize method (Map(TriplePattern, Long) to Map(Int, Long) for edgeCounts, subjectCounts, objectCounts)
Merge branch 'debugging-march3' of https://github.com/uzh/triplerush into debugging-march3

Conflicts:

src/main/scala/com/signalcollect/triplerush/optimizers/CleverCardinality
Optimizer.scala

src/main/scala/com/signalcollect/triplerush/optimizers/PredicateSelectiv
ityEdgeCountsOptimizer.scala