Changed docParaType handling to account for child elements
Changed docParaType handling to account for child elements

Previously was using valueOf_ string for contents but now a separate
self.content attribute is maintained with child nodes which can be
processed appropriately to account for refs and other non-text nodes.

AnthonyTruchet/breathe,RR2DO2/breathe,RR2DO2/breathe,AnthonyTruchet/breathe,kirbyfan64/breathe,AnthonyTruchet/breathe,kirbyfan64/breathe,kirbyfan64/breathe,AnthonyTruchet/breathe,kirbyfan64/breathe