Remove dead repo from parent pom.xml, remove guava in one place to give ...

Remove dead repo from parent pom.xml, remove guava in one place to give java compilation opportunity (test locally)
Replace weird MinMaxPriorityQueue (http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/collect/MinMaxPriorityQueue.html) for standard PriortiyQueue (http://docs.oracle.com/javase/7/docs/api/java/util/PriorityQueue.html). Since all this code wants from priority queue is getting minimum - it's easy to do it, using standard implementation.