created generic openable chests
added a treasure chest to gay-island-2
Merge branch 'master' into generic_spawn
Note: must remerge jhoff's changes from deleted file

Conflicts:
	src/maps/black-caverns.tmx
	src/nodes/enemies/turkey.lua
	src/nodes/enemySpawn.lua
removed unnecessary image
weapon tweak
Merge branch 'generic_spawn' into keys
WIP 1
added support for doors and chests to use keys
added door sound effects
removed unnecessary key material
changed white crystal to a key
changed location of unlock sound activation
Merge pull request #874 from NimbusBP1729/keys

Keys/Lockable Doors