Fix cookie secret key in Slim::getEncryptedCookie()
Fix cookie secret key in Slim::getEncryptedCookie()

Fixes #209

Alex2147483647/Slim,AndrewCarterUK/Slim,iinux/Slim,huang53798584/Slim,chezzy/Slim,prashantquestionpro/Slim,JoeBengalen/Slim,kanellov/Slim,slimphp/Slim,mnapoli/Slim,tanuck/Slim,mmauri04/Slim,julianromera/Slim,jeremykendall/Slim,AI0day/slim,foxyantho/Slim,Vinniefern99/Slim,luizdeangeli/Slim,designermonkey/Slim,makelivedotnet/Slim,swantrace/Slim-1,gabriel403/Slim,nslod/Slim,jaapverloop/Slim,lcp0578/Slim,cesarmarinhorj/Slim,gencer/Slim,RealSelf/Slim,beealone/Slim,lekoaf/Slim,fredemmott/Slim,iinux/Slim,EhteshamMehmood/Slim,zither/Slim,samsonasik/Slim,anuradhaedirisuriya/Slim,fsciuti/Slim,opengeek/Slim,dkarvounaris/Slim,ColourboxDevelopment/Slim,danielgsims/Slim,shameerc/Slim,1nv4d3r5/Slim,matheusgomes17/Slim,umiyosh/SlimDocDemo,lmcro/Slim,lornajane/Slim,umiyosh/SlimDocDemo,kutanari/Slim,silentworks/Slim,pedro2555/Slim,joelgarciajr84/Slim,abfadel/Slim,dopesong/Slim,FraGoTe/Slim,szulilin/Slim,akrabat/Slim,iinux/Slim,somjit2514/basic,jenalgit/Slim,moufmouf/Slim,feryardiant/slim,pine3ree/Slim,tempbottle/Slim,xMolchy/Slim,xiuchanghu/Slim,bact197736/Slim,asaokamei/Slim,juliangut/Slim,andresvidal/Slim,geggleto/Slim,Sam-Burns/Slim,taohaolong/Slim,greevex/Slim