fix iter 'attributes'
fix iter 'attributes'

NamedNodeMap is remaed to MozNamedAttrMap since Fx22.
see: https://bugzilla.mozilla.org/show_bug.cgi?id=847195

stemar94/vimperator-labs,nullren/vimperator-labs,nullren/vimperator-labs,Sheile/vimperator-labs,Quicksaver/vimperator-labs,zklinger/vimperator-labs,seanmorton/vimperator-labs,paretje/vimperator-labs,stemar94/vimperator-labs,paretje/vimperator-labs,mcarton/vimperator-labs,Sheile/vimperator-labs,Evidlo/vimperator-labs,derenio/vimperator-labs,Evidlo/vimperator-labs,seanmorton/vimperator-labs,zklinger/vimperator-labs,derenio/vimperator-labs,airodactyl/airodactyl,mcarton/vimperator-labs,airodactyl/airodactyl,Quicksaver/vimperator-labs