Adds #upsert_operation to figure out what happened #75
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This pull request adds a new #upsert_operation method that allows to determine what happened in the last upsert call.
As this is mostly useful in callbacks, this pull-request also fixes a problem where attributes loaded from the database wouldn't be update until after the callbacks were called.
Additionally, it changes the way the attributes from the database are set on the model. It now uses a similar way as ActiveRecord itself.