networkx 2 compatibility

[YamLyubov]

This version allows using both networkx 1 and networkx 2. Most changes are connected to formating.

Main changes to allow networkx 2 usage are:

• (G.subgraph(c).copy() for c in nx.connected_components(G)) instead of nx.connected_component_subgraphs(G) (cause the function was deprecated) here and here
• converting returned object to dict list(dict(G.degree()).values()) instead of list(G.degree().values()) here
• converting returned object to list [list(G.neighbors(i)) for i in range(n)] instead of [G.neighbors(i) for i in range(n)] here

#2