Similar to eval, the include_string function (and other include functions) should have a way to specify what module the string is evaluated in. Maybe just an optional third argument?

I noticed this today because a student wanted to use include(....) to load a file, but instead of looking in the current directory it was looking in ~/.julia/IJulia/src: apparently since include_string is being called from a function in the IJulia module then it is evaluated in that module rather than in Main as I intended.

cc: @JeffBezanson