node test
linux build fix
moved utilities and hashmap below fs, fin, fout
api change: all .save(fout) methods return fout instead of self - useful for chaining, for example: mat.save(fs.openWrite('mat.bin')).close(). moved snap and utilities below fs, fin, fout. added graph save/load.
graph load fix
Merge pull request #58 from rupnikj/master

minor api change: all save methods return fout instead of self. nodejs code, graph binary save/load