phantomas.getDOMPath: improve results

Add index of child node if nor class nor ID is found

19:08:14.923 Sizzle called: table table, fake (context: unknown)
19:08:14.924 Sizzle called: tr (context: body > section#wkPage > article#wkMainCnt > div#mw-content-text > table[78])
19:08:14.924 Sizzle called: tr (context: body > section#wkPage > article#wkMainCnt > div#mw-content-text > table[118])
19:08:14.924 Sizzle called: tr (context: body > section#wkPage > article#wkMainCnt > div#mw-content-text > table[122])