``using`` with mis-capitalized package name

[malmaud]

At least under OS X, there's a slight issue if you try using [some module], where the module is spelled right but capitalized incorrectly. It issues a warning when it (arguably) should issue an error.

julia> using distributions
Warning: requiring "distributions" did not define a corresponding module.

julia> Normal(0,1)
ERROR: Normal not defined

julia> using Distributions

julia> Normal(0,1)
Normal( μ=0.0 σ=1.0 )

[StefanKarpinski]

This is arguably one place where we should probably work around the braindeadness case insensitivity of the underlying file-system.

[goretkin]

If you do it in the opposite order, other interesting (but seemingly inconsequential) things happen

julia> using Distributions

julia> using distributions
Warning: replacing module Distributions
Warning: Method definition convert(Type{BigFloat},MathConst{:halfπ}) in module Distributions at constants.jl:38 overwritten in module Distributions at constants.jl:38.
Warning: Method definition convert(Type{Float64},MathConst{:halfπ}) in module Distributions at constants.jl:43 overwritten in module Distributions at constants.jl:43.
...
Warning: Method definition convert(Type{Float32},MathConst{:loghalf}) in module Distributions at constants.jl:44 overwritten in module Distributions at constants.jl:44.
Warning: requiring "distributions" did not define a corresponding module.