Move session start after Request, Response instantiation
Move session start after Request, Response instantiation

Fix Slim::log depedency on Slim_Logger class

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