Add lastModified columns to cacheable entities
Changing how the item caching works
Session supports caching headers, should probably rework this class more
Thumbnail caching should be nice, added here
While I'm making changes to lastModified, decided to add PreUpdate to download entity
Lastly, domain entity will return 304 if not modified
* left a TODO to maybe check the item tree for whether to refresh the domain in the database
Merge pull request #854 from jiwalker-usgs/lastModified

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