moved alchemy file to vendor directory in better keeping with rails conventions
removed Array monkeypatch 'sum_entity_column' definition and replaced calls
removed monkeypatch Array.plucky(attr_name) definition from environment.rb, and replaced calls wit h Array.map
removed Array.mode monkeypatch definition and implementations, replaced with most_common_value(array)
moved most_common_value function from environment.rb to entry_utils module