After much work the 2.0.0 of the NBTApi (dropped the Item part where possible) is done! Changelog:

• inventivetalent donated the new module "NBTInjector" that now makes it possible to save custom tags to Tiles and Entities!
• Many performance/bug/consistency fixes
• Moved from Jitpack to CodeMC (Don't use the old repo!)
• The entire public codebase is now documented, so make sure Maven/Gradle pull the javadocs!
  
• Instead of silently failing all methods are now throwing unchecked NbtApiException's
• NBTList's now implement the java List interface to make them useable in combination with other code
  
• Updated the Spigot page with more examples, usage and infos
• bStats is now inside the API instead of the plugin, so it even works when shaded
• Shading now requires relocating the packages to prevent conflicts between plugins with different versions
• The new plugin name for dependencies is "NBTAPI" and the package changed to "de.tr7zw.nbtapi"("de.tr7zw.changeme.nbtapi" when working with the not yet shaded+relocated api). The 2.0.0 version can be run at the same time as the 1.8.x versions to allow outdated plugins that still need "ItemNbtApi" to work
• Reworked the startup tests to provide better output and be better extendable

Feel free to join the Discord in case you need help with updating or the new NBTInjector.