deps.jl issue?

=================================[ ERROR: GSL ]=================================

LoadError: MethodError: `joinpath` has no method matching joinpath(::UTF8String, ::Char)
Closest candidates are:
  joinpath(::AbstractString)
  joinpath(::AbstractString, !Matched::AbstractString)
  joinpath(::AbstractString, !Matched::AbstractString, !Matched::AbstractString...)
while loading /home/travis/.julia/v0.4/GSL/deps/build.jl, in expression starting on line 30

Thanks for looking into the Linux failures. It works perfectly on my Linux machine.

I have isolated the problem to the @BinDeps.install line. Somewhere inside, it is calling joinpath and failing miserably to join a UTF8String with a Char.

I have been unable to determine which of the many calls to joinpath in BinDeps generates this error, or why Travis's setup would cause this to happen. I suspect that the logic in BinDeps may assume that directory subpaths are not 1 character long.

Until this issue is resolved, all I can do is disable testing on Linux until further notice.

This looks like you've somehow triggered a very bad BinDeps bug. I do think we should do our best to pinpoint the cause and try to fix it in BinDeps.

@jiahao I figured it out (see master...tkelman:travistest and JuliaPackaging/BinDeps.jl@master...tkelman:debug) - you were I was using the aliases keyword argument incorrectly, you're supposed to provide an array of strings, not just a single alias string. The error message was inscrutable and awful to debug, so maybe BinDeps could do something smarter with a warning if it detects this mistake.

Oh, wait, I added that alias. My bad, sorry! 9a9ce85

also cc @AndyGreenwell

I'm still not entirely sure why the apt-get provider isn't working here, but at least the source build works after fixing the alias issue.

Oh wow, talk about subtle. Thanks for tracking it down!

Merging to reenable Linux tests