Power law fitting added to GraphProperties
Power Law fitting added to GraphProperties and compiles. Added a gtest, but currently doesn't work.
Power law fitting has been added as well as a gtest for it.
Need boost/math/special_functions/zeta.hpp and accompanying headers to compile.
Also, the directory holding these headers needs to be included in lib_graphd/src/Makefile
Merge branch 'features'
Fix graph_stats to emit a warning if calling shortest_paths_boost and it's not compiled in.  Previously was silently failing
Merge pull request #30 from MattBBaker/master

parallel make fixups
Starting BC calculations; gives wrong answer
- reimplement betweenness centrality using boost methods
- code clean
Merge branch 'betweenness'
Added delta hyperbolicity code along with corresponding gtests.
The gtests cover connected and disconnected graphs.
Currently, requires omp to compile and run.
Merge remote branch 'upstream/master'
Fix valgrind complaints about memory leaks
Merge pull request #29 from jdlschrock/master

Adding power law fitting from jdlschrock
Merge branch 'master' into features

Conflicts:
	lib_graphd/inc/GraphProperties.h
	lib_graphd/src/GraphProperties.cpp
Added powerlaw and delta hyperbolicity to graph_stats.cpp
Merge remote branch 'upstream/master' into merge_test

Conflicts:
	util/src/graph_stats.cpp
Fixing boost_graph not wrapped in ifdef and moving betweenness variable outside ifdef region in header.
Fixing allocation of array with variable size by replacing with vector and resize/dynamic allocation
fixes for building with metis and no openmp
Merge branch 'fix-kcores'