MediaEmbed: added SlideShare
Cleaned up whitespace in composer.json, unused code in convert5.3.php. No functional change intended [ci skip]
Whitespace [ci skip]
MediaEmbed: renamed "match" to "extract" since it's not used for matching URLs but rather for extracting data from them
Made use of the fluent interface. No functional change intended
MediaEmbed: added support for scraping IDs from links