Added checks against img alt tag content sub-nodes (#6)
Added checks against img alt tag content sub-nodes (#6)

* Added ability to validate whether or not a given img element has a valid sub-element under readAloud/ (Acceptable sub-elements: textToSpeechPronunciation, textToSpeechPronunciationAlternate, audioText, audioSortDesc, audioLongDesc)

SmarterApp/TabulateSmarterTestContentPackage