Improvements to tutorial node iterator example / descriptions#114

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jthluke wants to merge 3 commits intosnap-stanford:masterfrom

Commits on Dec 13, 2019

Added suggestions to todo.txt. Adjacency and incidence matrices would be very useful for future student projects.
Justin Luke
committed
Added suggestions to todo.txt. Adjacency and incidence matrices would be very useful for future student projects.
Justin Luke
committed
Modified the node iterator example to make use of the "useful methods" listed. Also added description for GetOutEdges()/GetInEdges(), especially since their names are misleading (returns generator …
Justin Luke
committed