remove a string eval
check we can have a formatter that doesnt register to events
register listeners based on the messages they subscribe to
refactor to make register_listener a public api
tweak html to pass xmllint
fix formatter so it will pass xmllint
update all formatters
configure warnings
document feature
changelog
set $VERBOSE in config
formatting
Merge pull request #890 from JonRowe/enable_warnings

Configure warnings behaviour with --warnings
Show warnings
Show the slowest example groups along with the slowest examples in a report when using `--profile COUNT` (default 10).
Cosmetic changes.
Add example group's filename and line number in the output.
Use the same style as for the examples.
Treat the same doc string in different files as different example groups.
Merge pull request #887 from lfu/master

Show the slowest described classes along with the slowest examples in a report when using `--profile COUNT`