file size reduction
Merge pull request #798 from mwernimont/master

file size reduction
gathering all the attributes so aggregations can have an sld
* works for shorelines, may have more usefulness going forward
* improved documentation on SLDResource
* minor changes to incorporate new ItemUtil
Merge pull request #799 from jiwalker-usgs/aggregateSLD

gathering all the attributes so aggregations can have an sld