07-31-2015 Remove deprecated methods associated with PR 155

[elrayle]

Search for DEPRECATION and remove any deprecated methods with a target date of 07-31-2015 or earlier.

[grosscol]

aggregates_collections.rb still has a non-deprecated child_collections_ids method. It's a convenience method and the only method left in the AggregatesCollections module. Not sure where this method should live or what the a better name for the module might be.

    def child_collection_ids
      child_collections.map(&:id)
    end

Perhaps collection_behavior.rb is a better place for it. Thoughts?

[grosscol]

The get/add/remove related object calls are not deprecated, but this issue is being punted on until the resolution of #86.

[tpendragon]

@grosscol If you remove that method you should still get child_collection_ids from the association readers.