add config dependency on enabled markdown plugins (Issue #1523)
add config dependency on enabled markdown plugins (Issue #1523)

jjconti/nikola,JohnTroony/nikola,okin/nikola,okin/nikola,getnikola/nikola,getnikola/nikola,x1101/nikola,atiro/nikola,yamila-moreno/nikola,s2hc-johan/nikola,x1101/nikola,gwax/nikola,x1101/nikola,TyberiusPrime/nikola,knowsuchagency/nikola,xuhdev/nikola,getnikola/nikola,getnikola/nikola,TyberiusPrime/nikola,andredias/nikola,xuhdev/nikola,s2hc-johan/nikola,atiro/nikola,schettino72/nikola,masayuko/nikola,JohnTroony/nikola,immanetize/nikola,andredias/nikola,schettino72/nikola,yamila-moreno/nikola,yamila-moreno/nikola,knowsuchagency/nikola,wcmckee/nikola,techdragon/nikola,jjconti/nikola,gwax/nikola,pluser/nikola,berezovskyi/nikola,jjconti/nikola,JohnTroony/nikola,wcmckee/nikola,techdragon/nikola,masayuko/nikola,okin/nikola,okin/nikola,gwax/nikola,immanetize/nikola,pluser/nikola,xuhdev/nikola,immanetize/nikola,lucacerone/nikola,schettino72/nikola,berezovskyi/nikola,knowsuchagency/nikola,atiro/nikola,andredias/nikola,lucacerone/nikola,berezovskyi/nikola,lucacerone/nikola,s2hc-johan/nikola,masayuko/nikola,wcmckee/nikola,TyberiusPrime/nikola,pluser/nikola,xuhdev/nikola,techdragon/nikola