Triangle count

Implements streaming triangle counting algorithm by Madhav Jha et al.
Computes also transitivity.
Tunning parameters on 100 runs
Merge pull request #62 from szymonm/TriangleCount

triangle count - alpha version #49
Writing graph to multiple files
Tool to convert list of edge to adjacency list
Tool to convert list of edge to adjacency list
Review fixes

* Move ListOfEdgesToAdjacencyListConverter to examples
* Spell check