Show title of pull requests

[waldyrious]

Currently only the body of issues and pull requests is shown. For issues, both the title and the body is shown.

For simple PRs where the information is contained in the title (and in general, for proper context, and for consistency), it would be helpful to also display the title.

While we're at it, perhaps the titles should be formatted differently from the body -- say, as bold, or something similar.