added test_g_nodes
added test_g_edges
refactored test_g_edges
Implement Graph class and nodes, edges methods
added test_g_init
added Graph.add_node (and test)
added add_edge (tested)
added test_g_add_node
added Graph.del_node and test
added more tests for del_node
added has_node
added neighbors and tests
almost ready
fixed edges
Fixed bugs, variable names
Fixed test names
Fixed neighbors test
Ready for deployment
Update readme
Merge pull request #8 from MikeDelaney/simple_graph

Simple graph