Added description based view operations
Added description based view operations

Following API endpoints have been added in this patch:
01. IsDescriptionPresent
02. IsMatchingDescriptionPresnt
03. ClickDescription
04. ClickMatchingDescription
05. GetDescriptionForText
06. GetDescriptionForMatchingText
07. GetDescriptionForResource
08. GetDescriptionForMatchingResource
09. GetDescriptionFortype
10. GetDescriptionForMatchingType

kunaldawn/goandroid,antonienko/goandroid