Bring XML encoding detection inline with XML spec.
Bring XML encoding detection inline with XML spec.

songfj/simplepie,FreshRSS/simplepie,ropik/simplepie,mblaney/simplepie,simplepie/simplepie,skyzyx/simplepie,barryvdh/simplepie,simplepie/simplepie,ropik/simplepie,gsnedders/complexpie,FreshRSS/simplepie,Alkarex/simplepie,barryvdh/simplepie,wikidi/simplepie,blat/simplepie,mblaney/simplepie,wikidi/simplepie,wikidi/simplepie,Alexia/SimplePie,skyzyx/simplepie,songfj/simplepie,songfj/simplepie,blat/simplepie,Alexia/SimplePie,blat/simplepie,barryvdh/simplepie,Alkarex/simplepie,Alkarex/simplepie