GFM-Style Fenced Code Blocks Only (no lang attribute)
GFM-Style Fenced Code Blocks Only (no lang attribute)

Removing the additional code that I applied previously to implement the `data-lang` attribute. In retrospect, this was a bad idea; as the existing implementation does a good job with this already when used properly.

Many thanks to Michel Fortin for his help in accomplishing these changes :-) I hope this might be merged into the official copy at some point in the future.
nazar-pc/php-markdown-next,filipstefansson/bootstrap-3-shortcodes,Kapeli/php-markdown,MWDelaney/bootstrap-3-shortcodes,MWDelaney/bootstrap-3-shortcodes,robbieaverill/php-markdown,queirozfcom/php-markdown-with-syntax-highlight,jockchou/php-markdown,filipstefansson/bootstrap-3-shortcodes,mariokonrad/php-markdown,n054/php-markdown,MWDelaney/bootstrap-3-shortcodes,ashur/php-markdown