SchemaPlus / schema_plus / 395

Pull #191

travis-ci

Duplicate the given options from the migration instead of modifying in place.

This allows the same options to be used by different parts of the migration script, e.g.

```ruby
hash = { references: :users }
t.references :creator, foreign_key: hash
t.references :updater, foreign_key: hash
```

Which would be invalid otherwise.

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