WIP: Integrate IPython setup on windows

I tested this on a brand new windows system with nothing but julia installed:

````julia
Pkg.clone("https://github.com/davidanthoff/IJulia.jl.git","IJulia")
Pkg.checkout("IJulia", "integratedipysetup")
Pkg.build("IJulia")

using IJulia
notebook()
````

works on that system.

This PR lacks proper error handling etc, consider it more a proof of concept.
I agree. If people want Python packages we should encourage Anaconda,
WinPython, or PythonXY (in that order, IMHO). They are not hard to install,
and it seems silly to duplicate their substantial efforts. Having a no-fuss
install will be great, but the situation where this is most useful is for
using IJulia strictly with Julia packages. Then IPython is just an
implementation detail.


On Thu, Aug 7, 2014 at 10:20 AM, Steven G. Johnson <notifications@github.com
> wrote:

> In deps/build.jl:
>
> > @@ -5,6 +5,28 @@
> >  # print to stderr, since that is where Pkg prints its messages
> >  eprintln(x...) = println(STDERR, x...)
> >
> > +if @windows? true : false
>
> If you are using PyCall, I don't think you'd want a locally controlled
> Python. The whole point of PyCall is to call external Python packages, so
> it needs to be easy for the user to install packages, not just Python
> itself. That means that users of PyCall will probably want to be using a
> "standard" Python distribution via Anaconda, pip, or similar, rather than
> having Julia be calling a hidden private Python distro that ordinary users
> won't understand how to install things into.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/JuliaLang/IJulia.jl/pull/211/files#r15937865>.
>