fix #7

fixes #7

32 bit https://ci.appveyor.com/project/tkelman/ecos-jl/build/1.0.3/job/owy7fobin6qaslc3
64 bit https://ci.appveyor.com/project/tkelman/ecos-jl/build/1.0.3/job/vnfxkgon65el7mn9

I see quite a bit more test output on a Linux machine than I do on Win32, but the tests apparently aren't flagging any errors? And Win64 segfaults. Smells like an integer size problem, either in the Julia bindings or in ECOS itself.