Removed dependance on .name for eliminate_var. Still a lot of work.
Minor change in bbn.py to deprecate .value most work is actually in factor_graph.
No reliance on .value, needs to be tested more before merge into master.
Merge branch 'master' into deprecate_use_of_value
Almost there removing reliance on .value
Removed .value from walk factor graph example.
Added walk example to examples/bbns.
Removed olivers_blood example from factor_graphs as its dumb.
Removed all .value dependence!
Took .value out of tutorial.