Suppress summarize message: spelling

[cbrnr]

The docs mention that setting options(dplyr.summarise.inform=FALSE) suppresses the informative message when .groups is not specified. Since both American and British spellings are treated equally throughout the package, I was expecting that options(dplyr.summarize.inform=FALSE) also works, but it doesn't. Given that there is no error message when setting that option, I think this behavior might be confusing (it was to me, because I did not notice the spelling difference immediately).

Therefore, I would like to suggest to add dplyr.summarize.inform as an alias for dplyr.summarise.inform.

[hadley]

Given that we're moving away from this warning (in favour of using .by), I think unfortunately it's more effort than it's worth.