Split ``leastbot.github`` into ``leastbot.github.webhook`` and ``leastbot.github.formatter``.
Tranparently switch from ``%`` interpolation to ``string.format`` in ``leastbot.github.formatter`` (no change to test spec).
Move ``leastbot.github.formatter._AttrLookupWrapper`` → ``leastbot.formatutil.DictFormatWrapper``.
Add a ``dedent`` utility which allows writing indented triple-quote strings for readability.
Adjust the expectation for formatting such that it should be newline terminated.  Replace formatter implementations with ``dedent``-based templates.
Bump to dev version 0.2.1.dev0 for "live deployment testing" and update the url; the latter slightly out of scope for #16.