initial commit for basic thumbnail service
added ability to combine children
ribboning works for aggregations
clean up and dim.y dim.x vars swapped for 150
service w/ item ID framed out
v1.2.16 basic publication categories and thumbnail
v1.3.0, thumb service and aggregation peeler
v1.3.1 takes json.url as input, creates thumb
function now returns location of png, delets temp
added support for ribbonable w/ rules
ribbon test passed
Update thumb.service.R

bring back the requires
Merge pull request #1 from jiwalker-usgs/thumbService

Update thumb.service.R
Merge pull request #2 from jread-usgs/thumbService

Thumb service branch