Tim St. Clair b4116eb718 Handle nil Amount in resource.Quantity.{Add,Sub} ...

Treat `nil` Amount as 0 in `resource.Quantity.Add` and
`resource.Quantity.Sub`. Also, allow adding/subtracting resources with
different Formats (since Format has no effect on the underlying value).

2015-12-10 19:24:23 -08:00

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