Request for Demo C: chemical-disease correlated_with edge with score to aid in ranking

[bill-baumgartner]

Demo C would like to be able to rank results based on the specificity of a drug to a given disease, i.e. drugs that target a given disease, and only that disease should be ranked higher than drugs that may be associated with the given diseases as well as other diseases.

The predicate to use may be correlated_with or may be a new predicate yet to be determined.