Rudy/windows cleanup

A bunch of windows cleanup:
- There is the work of @conorbranagan for the UI installer that I got in my branch (#991). Tested on all the machines I had, work both with the command line and by executing it manually.
- Fix for the services_checks renaming to network_checks
- Packaging fixes:
    - Properly bundling gohai with the installer
    - Remove the need to patch spyderlib on the build box
    - Make sure that numpy doesn't get bundled with the agent even if it's installed on the build box, still didn't figure out why py2exe is picking it up.
    

 
Fixed. Thanks Remi