I do this via Pkg.dir()*"/MyPackage". If there is any better solution, I'd be quite curious to know!
This looks like a cool package! =) I just implemented an OpenGL image viewer, which theoretically can tile images very easily, as OpenGL does the tiling for you. If you're interested take a look at: https://github.com/SimonDanisch/GLPlot.jl/wiki What do you plan on doing with this, if I may ask?
