Support Layout and Format nodes in text and shield symbolizers#62

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hollinger wants to merge 2 commits intomapnik:masterfrom

MapQuest:jmh-sym-content

Commits on Jun 23, 2014

Add reference data for child elements that can exist inside of text and shield symbolizers.
hollinger
committed
Update tests to support the child-elements array and test the element reference data.
hollinger
committed