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* [Misc] clang-format auto fix.

* manual

* manual

* manual

* manual

* todo

* fix
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

* traversal to new framework

* add new

* Fix compile

* Pass test

* keep old version

* lint

* lint

* Fix

* Fix

* Fix compatability with new master

* Fix test and tutorials

* Update according to comments

* Fix test
Co-authored-by: Ubuntu <ubuntu@ip-172-31-51-214.ec2.internal>

* WIP: using object system for graph

* c++ side refactoring done; compiled

* remove stale apis

* fix bug in DGLGraphCreate; passed test_graph.py

* fix bug in python modify; passed utest for pytorch/cpu

* fix lint

* address comments

* bfs with edges

* dfs toy test case

* clean up

* style fix

* bugfix

* updating docs for bfs_edges and readouts

* Fix bug in bfs and topo

* remove legacy codes

* bfs, dfs and topological traversal

* dfs and test cases

* Conflicts:
	python/dgl/graph.py
	src/graph/graph.cc
	src/graph/graph_op.cc

* documentation

* requested changes

* Conflicts:
	Jenkinsfile
	examples/pytorch/gcn/gcn.py
	examples/pytorch/gcn/gcn_spmv.py
	python/dgl/graph.py
	python/dgl/graph_index.py
	src/graph/graph.cc
	src/graph/graph_op.cc

* Conflicts:
	Jenkinsfile
	python/dgl/graph_index.py

* fix lint errors

* fix lint errors

* fix lint errors

* fix test cases

* requested changes

* traversal interface

* [Bug] fixed a typo that caused syntax error (#120)

* WIP

* bfs nodes generator works

* topological traversal

* WIP: dfs_edges

* dfs edges

* dfs labeled edges

* utest for traversal

* fix lint

* fix utest

* code clean

* changes as requested