Tentative Windows support
Complete windows support via crude hack

Also, fix some things in tests:
1) close workspace before deleting outfile
2) call rand with the correct argument type on 32bit systems
more hacking for windows: allow 64-bit and 32-bit dlls to coexist
append 32/64bit tags to dlls
update travis links
Merge pull request #12 from JuliaOpt/win

Merge windows support