node.prev() added for TNGraph and TNEGraph, edge.last removed
node.prev() added for TNGraph and TNEGraph, edge.last removed
adjacency matrix added
Merge pull request #50 from mkarlovc/master

node.prev() and edge.last update
Merge branch 'master' of github.com:qminer/qminer

Conflicts:
	src/qminer/qminer_js.h
cleanup + doc