set up basic directed_graph
add DBLP parsing to graph-test
add mini dblp dataset for testing
add metapath measures for symmetric metapaths
add naive all pairs similarity calculation
move dblp graph creation into its own file
add ability to create dblp graph based on paper years; update allpairs calculation
skeleton for PathPredict app
remove sentence markers from cosine similarity scoring and only record similarities above a threshold
record incoming edges in the directed graph
add metapath object
make document default-constructable
update PathPredict meta-format output
Merge branch 'develop' into graph

Conflicts:
	CMakeLists.txt
add reverse function to metapath and write simple unit tests
add support for non-symmetric metapaths in PathPredict
reorganize PathPredict files (create path_predict class)
add config options to path_predict
path_predict feature generation done; gives very unbalanced classes
fix metapath NPC measure and add ability to print out metapaths