fnurkla

Silence byte compilation warnings

3

These changes silence a couple of byte compilation warnings, namely: - that the `pi` variable has been obsolete since Emacs 23, and - that the lexical variable `value` is unused....

The success stories link at the bottom on the front page leads to a [non-existing wiki page](https://github.com/buildbot/buildbot/wiki/SuccessStories). It's [right here](https://github.com/buildbot/buildbot-website/blob/c9cd7bb4cc4f1734d84e14d8c2ad374ec83e658b/src/about.jade#L13) in the source.