Update comments + Bugfix: allow application/xhtml+xml content-type.
Update comments + Bugfix: allow application/xhtml+xml content-type.

sherlock221/instantclick,nishant8BITS/instantclick,blahgeek/instantclick,shizhua/instantclick,alexlur/snap,dieulot/instantclick,EagerApps/instantclick,alexlur/snap,sherlock221/instantclick,Gizeta/instantclick,Gizeta/instantclick,TBRSS/instantclick,Gizeta/instantclick,alexlur/snap,dmitrylakhno/trueinstantclick,blahgeek/instantclick,misog/instantclick,EagerApps/instantclick,misog/instantclick,sherlock221/instantclick,dieulot/instantclick,blahgeek/instantclick,misog/instantclick,EagerApps/instantclick,dieulot/instantclick,nishant8BITS/instantclick,TBRSS/instantclick,TBRSS/instantclick,shizhua/instantclick,alexlur/snap,shizhua/instantclick