Revert "fix: __iterator__ set on Xray's XPathResult object not being called"

This reverts commit f064f046a83a8612d370077fc1036d6b1a72e9d8.

see https://github.com/vimperator/vimperator-labs/pull/50#issuecomment-59265311
fix: __iterator__ set on Xray's XPathResult object not being called