CI (appveyor) fails, update configs

[Borda]

Some difficulty with building the code on travis and appveyor, correct configuration needed

• travis

  OSError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/numpy-1.12.0.dist-info'
  The command "pip install -r requirements.txt" failed and exited with 2 during .

• appveyor

  make download
  'make' is not recognized as an internal or external command, operable program or batch file.
  Command exited with code 1

[Borda]

Travis solved by see 7af7838

[Borda]

C:\Users\appveyor\AppData\Local\Programs\Common\Microsoft\Visual C++ for Python\9.0\VC\Bin\link.exe /DLL /nologo /INCREMENTAL:NO /LIBPATH:gco_source /LIBPATH:C:\Python27\libs /LIBPATH:C:\Python27\PCbuild /LIBPATH:C:\Python27\PC\VS9.0 /EXPORT:initlibcgco build\temp.win32-2.7\Release\gco_source\LinkedBlockList.obj build\temp.win32-2.7\Release\gco_source\graph.obj build\temp.win32-2.7\Release\gco_source\maxflow.obj build\temp.win32-2.7\Release\gco_source\GCoptimization.obj build\temp.win32-2.7\Release\cgco.obj /OUT:C:\projects\pygco\libcgco.pyd /IMPLIB:build\temp.win32-2.7\Release\gco_source\libcgco.lib /MANIFESTFILE:build\temp.win32-2.7\Release\gco_source\libcgco.pyd.manifest
LINK : error LNK2001: unresolved external symbol initlibcgco
build\temp.win32-2.7\Release\gco_source\libcgco.lib : fatal error LNK1120: 1 unresolved externals
error: command 'C:\\Users\\appveyor\\AppData\\Local\\Programs\\Common\\Microsoft\\Visual C++ for Python\\9.0\\VC\\Bin\\link.exe' failed with exit status 1120

[Borda]

see fix for Windoes

[Borda]

see https://stackoverflow.com/questions/34689210/error-exporting-symbol-when-building-python-c-extension-in-windows