Issue loading Caffiene images

[JordanMajd]

On new install:

2017-05-12 11:28:32: -- Lazy extension loading enabled
2017-05-12 11:28:32: -- Loading ~/.hammerspoon/init.lua
2017-05-12 11:28:32: -- Loading extension: hotkey
2017-05-12 11:28:32: 11:28:32     hotkey: Enabled hotkey ⌘⌥L
2017-05-12 11:28:32: -- Loading extension: menubar
2017-05-12 11:28:32: -- Loading extension: image
2017-05-12 11:28:32: *** ERROR: /Users/bluepenguin/.hammerspoon/lib/caffeine.lua:10: Unable to load image: ../assets/caffeine-on.pdf
stack traceback:
	[C]: in function 'hs.image.imageFromPath'
	/Users/bluepenguin/.hammerspoon/lib/caffeine.lua:10: in main chunk
	[C]: in function 'rawrequire'
	...app/Contents/Resources/extensions/hs/_coresetup/init.lua:529: in function 'require'
	/Users/bluepenguin/.hammerspoon/init.lua:2: in main chunk
	[C]: in function 'xpcall'
	...app/Contents/Resources/extensions/hs/_coresetup/init.lua:561: in function 'hs._coresetup.setup'
	(...tail calls...)

Fixed by using path for files ~/.hammerspoon/assets/caffeine-on.pdf but I would like to avoid using the home directory and use project pathing instead in case someone installs to another directory.