Add a propagate attribute to edge

Propagate attribute shows if it was able to propagate 
priority across the link
Implement multiply initialization seeds
Shuffle first-level initialization seeds.
Do rectify instead of dump
check with_incomplete key to dump incomplete vertices
Point out acceptable host
Merge branch 'save_gml' into multiseed

Conflicts:
	src/main/scala/ru/wordmetrix/webcrawler/EvaluatePriorityMatrix.scala
	src/main/scala/ru/wordmetrix/webcrawler/WebCrawler.scala
Fix tests