fixed reading mimetype from headers, some sites specify charset for images...
fixed reading mimetype from headers, some sites specify charset for images...

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