Update podspec to 1.0.8.
Update podspec to 1.0.8.

Also, update xcconfig => pod_target_xcconfig to fix #264.

qinyuhang/pop,jflinter/pop,dvan001/pop,dachaoisme/pop,BNakum/pop,GotEmB/pop,chromatic-seashell/pop,ChetanGandhi/pop,xingyuniu/pop,xingyuniu/pop,qinyuhang/pop,AlanJN/pop,telly/pop,hoaquo/pop,moneyfish/pop,Vanejay/pop,AlexanderMazaletskiy/pop,mtxs007/pop,tianxiao12345/pop,lijie121210/pop,imjerrybao/pop,telly/pop,moneyfish/pop,chromatic-seashell/pop,lijie121210/pop,tianxiao12345/pop,dachaoisme/pop,jflinter/pop,jmade/pop,mybdgw/pop,AlexanderMazaletskiy/pop,h136799711/pop,GotEmB/pop,dvan001/pop,ChetanGandhi/pop,AlanJN/pop,h136799711/pop,mtxs007/pop,imjerrybao/pop,Vanejay/pop,jcbertin/pop,jmade/pop,mybdgw/pop,jcbertin/pop,hoaquo/pop,BNakum/pop