replace dumb printf-style syntax with str.format

Signed-off-by: Kwpolska <kwpolska@gmail.com>
Added myself to AUTHORS.
Handle new warnings with tidy exceptions.
Accept time tag usage, tidy gives a false alarm there.
add commented default USE_BUNDLES
removed support for --help in build command because it breaks passing arguments to doit
jquery must go before bootstrap in js bundle
Fix #327
unused import
Fix Issue #276
oops, forgot a print
implement the doit command interface in the command plugins
use doit commands from the nikola script
ported to doit commands
better doc
fix doc
removed build (not needed anymore), ported bootswatch
ported check command
ported console command
ported import_blogger