[Feature Request] Support deployment behind a path

[VirtualGit]

It is common that services like Sharry are hosted on a local server, and accessed through a reverse-proxy publicly available.
As I have several services (and cannot have sub-domains), I address each of them through a sub-path in the url, like :

http://public-name/service1/
http://public-name/service2/
etc

As it is mentioned in the config file, this is not currently supported since the app will redirect navigator to http://public-ip/app, breaking the sub-path reversed proxy :

# Note: Currently deploying behind a path is not supported. The URL
  # should not end in a slash.

This ticket is for adding support of deployment in sub-path url.