Merge pull request #4 from sebers/develop

Missing version numbers for maven-source-plugin and maven-javadoc-plugin and testcase for BasicIndexRuleEvaluator added
joins and triple patterns now have after join order optimization again the correct union and intersection avraibles
small change
simplified fractal tree added
small change (private to protected)
small changes
bug in DBBPTree generation fixed
another small bug in DBBPTree generation fixed
merge union revised
executing queries without previous prepareInput, no import of data in graph when just accessing a non-existing one
count = 0 for empty input
joining with several default graphs in the memory index query evaluator
Removed no longer available and no longer needed repository 'aduna'