Change int to i32 in Cow example.

[solson]

r? @steveklabnik

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @steveklabnik (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. The way Github handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[steveklabnik]

Thanks @tsion ! GitHub says that this can't be merged, can you try rebasing? I wonder if someone has fix this in the meantime.

[solson]

It looks like the file borrow_stage0.rs which duplicated this example was removed. It should merge now.

[alexcrichton]

@bors: r+ 8db6465 rollup