add checks and stubs for openmp functions, in case of not compiling with openmp
forget to prettify the code
forgot to prettify the code before last commit
first shot at being fast
fix bug in fast adjacency list writing
Add some timing info to the edgelist converters
clean up util binaries when making clean
Add correct libgraphd.a dependencies so binaries get re-made
Adding assortativity statistic calculations
Merge branch 'master' into openmp
Adding OpenMP calculations for assortativity