Replace all occurances of $graph->getNumberOfVertices()
replaced with count($graph->getVertices())
Remove now unused Set::getNumberOfVertices()
Remove now unused Algorithm\Search\Base::getNumberOfVertices()
Replace all occurances of $graph->getNumberOfEdges()
replaced with count($graph->getEdges())
Remove now unused Set::getNumberOfEdges()
Set\DualAggregate interface replaces legacy Set class
Update references to new Set\DualAggregate
Rename Algorithm\BaseSet to Algorithm\BaseDual
Add replacement for `Set` to CHANGELOG
Update CHANGELOG
Merge pull request #75 from clue/remove-set

Remove base `Set`
Prepare v0.7.0 release
Update GraphViz.php

correct typo in classname
Update GraphViz.php

Removed debugging echos in display method
Merge pull request #77 from Metabor/patch-1

Fix typo in reference to UnexpectedValueException
Merge pull request #78 from Metabor/patch-2

Remove debugging output in GraphViz::display()
Add @Metabor's fixes to CHANGELOG
Remove Graph::getVertexFirst()
Update references to Graph::getVertexFirst()
Remove Walk::getVertexSource() and Walk::getVertexTarget()
Fix invalid reference to Vertices::getVertexFirst()