* proxy router for handling only proxy
* proxy/archival router for handling both archival and proxy mode,
togglable with 'enable_http_proxy' setting in config
* supports only most recent capture playback -- no support for
selecting replay date/calendar view yet
* not testable with WebTest -- need better way to unit test proxy mode
wrapping previous WbResponse
overhaul yaml config to be much simpler, move best resolver and
best index reader to respective classes
add config_utils for sharing config, standard non-yaml config
provides defaults for testing
fix bug in query.html
supports /cdx?url=... and other params including
filter=<regex>
collapse_time=<0-14>
resolve_revisits=<true|false>
reverse=<true|false>
closest=<timestamp>