Add Crates to constructions
Fix examine crash
Merge branch 'Crashfix' of https://github.com/i2amroy/Cataclysm-DDA into merge2
Merge branch 'Crates' of https://github.com/Snaaty/Cataclysm-DDA into merge2

Conflicts:
	data/json/construction.json

One less merge conflict in the world.
Re-use the lid and most of the nails, makes resealing crates much more economical.
JSON syntax fix