Auto merge of #6243 - btashton:strip_email_bracket, r=alexcrichton
Strip angle brackets from author email before passing to template.
Some people already have angle brackets around their email in
git settings or other author sources. Right now if you create
a new project the Cargo.toml would render something like:
`authors = ["bar <<foo@baz>>"]`
instead of
`authors = ["bar <foo@baz>"]`
This detects the emails that start and end with `<>` and removes them.