fix missing-feeds-notification and link

fixes #2
enforce trailing slash at the end media file base url

fixes #3
double quote escaping for Web Player title, subtitle and summary
fix default video file types
scnr :panda_face:
play nice: move remote js to local dir
fix huge download-select-font
warn user if curl_exec is unavailable
bump version number
New feature: record and publication date for episodes

* add record and publication date to episodes
* add shortcodes
* add options to enable/disable in expert settings
* disable by default
* update documentation and changelog
fix webplayer submodule