support parametrized and custom pygal styles (Fix #628)
support parametrized and custom pygal styles (Fix #628)

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