Alias function names to more common analysis names

[andy-esch]

List of function names to update (incomplete):

• [x] CDB_AreasOfInterestLocalRate --> CDB_MoransILocalRate (#202)
• [x] CDB_AreasOfInterestLocal --> CDB_MoransILocal (#202)
• [ ] CDB_GetSegmentAndPredict --> CDB_RandomForestRegressor
• [ ] CDB_Kmeans --> CDB_KMeansSpatial (note: this function also needs to accept an id_col argument #199)

This can be accomplished as follow:

CREATE OR REPLACE FUNCTION CDB_RandomForestRegressor(...) RETURNS ... AS $$
BEGIN
RETURNS QUERY SELECT * FROM CDB_CreateAndPredictSegment(...);
END;
$$ LANGUAGE plpgsql;

This SO answer is a bit more concise: https://stackoverflow.com/questions/40300728/function-alias-for-postgres-default-function?answertab=active#tab-top

Along with this, the docs should be updated to include the new function names and have a note that the old function name is deprecated.

cc @stuartlynn