WIP
added some util functions

– cli_output for logging
– extended config
– added logging to fetcher
– added caching to fetcher
fixes cli output, fixed temp path clearing, updated dependencies
added experimental prawn based pdf merger
removed byebug
fixing bug with unquoted paths for target pdf
no need to be private
added #title to article page
outputting full messages when debugging/being verbose
Showing a message if a pdf is missing in the archive
added cache_removal and cache_size_limit