added ender chests, named items

Ender Chest inventory is carried over now, as are item names.  Missing
colors for leather armor, but their presence won't crash the converter
now.  Same with item lore and fireworks (necessitated updating nbt
library to handle TAG_INT_ARRAY)
Merge pull request #1 from MamiyaOtaru/master

added ender chests, named items

Thanks!