Added maxPages, changed filtering youtubeDownloader

1. Added maxPages variable, setMaxPages() method to
youtubeDownloader

2. Changed filtering to match on both title and
filename.  They are only different in spacing, case,
and special characters.
Added a local file downloader

localFileDownloader(files) converts local files to podcasts,
using the default converter.
addl extension match; take list as well file
slugify from youtube to super, urlencode filenames
Added support for alternate output extensions

1. [get|set]OutputFormat added to podcastDownloader
2. Mp3 now a supported output format (setOutputFormat(".mp3"))
3. Fixed bug where process logic failed because convertReturn was
     not returning new file name.