This is a one command creation made by me(ClassyElm123). The command works with Minecraft version 1.8.8. Instructions are in the creation, but I'll go over the instructions anyway. If you want to skip to the command, scroll to the bottom of the post.

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Crafting:
To craft, throw 5 gunpowder and 4 sand on the same block as eachother and a spawn Mini-TNT spawn egg will be crafted.

Defusing:
To defuse, throw shears on the spawned Mini-TNT and it will drop itself.

Igniting:
To ignite the Mini-TNT, light fire on the same block as the Mini-TNT and it will then ignite.

Credit:
-Made by ClassyElm
-Used JSON Creator for Minecraft(http://minecraftjson.com/)
-Used MrGarretto's Command Combiner(http://mrgarretto.com/cmdcombiner)
Test
Command:
1.8: http://pastebin.com/XTfGtBxw
1.9: http://pastebin.com/qumFhfBs
1.10: http://pastebin.com/Rr407FZ4