fixed THashSet::Defrag()
Merge pull request #14 from floriangeigl/master

Fixed THashSet::Defrag
added a test for THashSet::Defrag()
Merge pull request #13 from nshelly/master

Updated GraphViz -- removed base file creation and .gif
Made vector access functions in NCP public.
fixed #35, infinite loop in SsParser
fixed #36 eigenvector centrality values are suspicious - results were OK, just normalized in L1 rather than L2
Updated Xcode project and fixed warnings.