[Development] Setup CI service

[Koehne Kai]

> -----Original Message-----
> From: Ben Lau [mailto:xbenlau at gmail.com]
>[...]
> Hi Kai,
> 
> I mean the official Qt offline installer (Linux) downloaded from
> https://download.qt.io/archive/qt/5.5/
> 
> Before Qt 5.5, it could be run in command line environment and extract its
> content by " --dump-binary-data". But this options has been dropped.

It got moved to an extra executable called 'devtool'.  You can still use it
by getting the IFW itself, e.g. from 
http://download.qt.io/official_releases/qt-installer-framework/2.0.1/ ,
and launching devtool with the installer as an argument.

Anyhow, also the installer itself can be scripted & execute automatically.

Regards

Kai