normalize /index.html behavior

Automatically adding the index.html to any route without checking if the
path has already an extension. Now, Acrylamid only appends an `index.html`
to a final URL if the location ends with a trailing slash.

The index pagination route has been changed to `/page/:num/`, notice the
trailing slash. If you use the default index pagination route, this will
immediately break as Acrylamid tries to create a file named `:num`.
sitemap excludes drafts with a different route than the permalink
normalize configuration as early as possible

fixes issues where code relies on a specific format before the
configuration has been normalized.
if no year, month or day in archive route, don't group and render twice

also: fix two cram tests due the new (and better) modification detection
add more defaults to avoid repition during retrieval, closes #114
temporary log initialization to catch errors during argparser extension
fix failing autocompilation with empty static directories

sorry @moschlar, the `chain(*map` idea survived as you unfortunately can
not evaluate `max([])`.
summarize filter accepts <!-- more --> also as break keyword
typos and dead code
fix 2to3 issues with local next variable