[FLOW3-general] Setup a CI integration server problem with vfsStream

[Dominique Feyer]

We start to configure a TeamCity CI server for a Flow project, to 
prepare the build, I use composer update --dev, and I have the error 
message:

[Composer\Downloader\TransportException]                                
                                                                        
The "https://api.github.com/repos/mikey179/vfsStream/zipball/v1.1.0" 
file could not be downloaded: failed to open stream: Connection timed 
out  

Any idea why ?

Bests,

Dominique Feyer