add warnings for deprecated configuration options
add warnings for deprecated configuration options

fanhero/thumbor,raphaelfruneaux/thumbor,2947721120/thumbor,jdunaravich/thumbor,Jimdo/thumbor,dhardy92/thumbor,gselva/thumbor,BetterCollective/thumbor,grevutiu-gabriel/thumbor,fanhero/thumbor,2947721120/thumbor,felipemorais/thumbor,camargoanderso/thumbor,raphaelfruneaux/thumbor,dhardy92/thumbor,thumbor/thumbor,jdunaravich/thumbor,aaxx/thumbor,davduran/thumbor,grevutiu-gabriel/thumbor,MaTriXy/thumbor,fanhero/thumbor,thumbor/thumbor,wking/thumbor,BetterCollective/thumbor,voxmedia/thumbor,camargoanderso/thumbor,jiangzhonghui/thumbor,food52/thumbor,2947721120/thumbor,figarocms/thumbor,wking/thumbor,raphaelfruneaux/thumbor,Jimdo/thumbor,felipemorais/thumbor,grevutiu-gabriel/thumbor,kkopachev/thumbor,jiangzhonghui/thumbor,voxmedia/thumbor,thumbor/thumbor,food52/thumbor,Bladrak/thumbor,scorphus/thumbor,marcelometal/thumbor,camargoanderso/thumbor,kkopachev/thumbor,raphaelfruneaux/thumbor,lfalcao/thumbor,lfalcao/thumbor,thumbor/thumbor,gi11es/thumbor,aaxx/thumbor,jiangzhonghui/thumbor,figarocms/thumbor,aaxx/thumbor,voxmedia/thumbor,adeboisanger/thumbor,gselva/thumbor,scorphus/thumbor,adeboisanger/thumbor,food52/thumbor,2947721120/thumbor,camargoanderso/thumbor,abaldwin1/thumbor,davduran/thumbor,scorphus/thumbor,MaTriXy/thumbor,scorphus/thumbor,suwaji/thumbor,davduran/thumbor,kkopachev/thumbor,wking/thumbor,Jimdo/thumbor,okor/thumbor,felipemorais/thumbor,felipemorais/thumbor,MaTriXy/thumbor,lfalcao/thumbor,figarocms/thumbor,adeboisanger/thumbor,gselva/thumbor,marcelometal/thumbor,adeboisanger/thumbor,figarocms/thumbor,abaldwin1/thumbor,gselva/thumbor,MaTriXy/thumbor,wking/thumbor,grevutiu-gabriel/thumbor,Bladrak/thumbor,okor/thumbor,jdunaravich/thumbor,BetterCollective/thumbor,okor/thumbor,jiangzhonghui/thumbor,gi11es/thumbor,jdunaravich/thumbor,lfalcao/thumbor,suwaji/thumbor,dhardy92/thumbor,abaldwin1/thumbor,marcelometal/thumbor,food52/thumbor,Jimdo/thumbor,suwaji/thumbor,suwaji/thumbor,kkopachev/thumbor,abaldwin1/thumbor,fanhero/thumbor,aaxx/thumbor,davduran/thumbor,gi11es/thumbor