Implement FR [#31875] [JAPPS*] [1] [CLIENT] Add "Install from web" installation method to Joomla installer (project Apps*)

With Many Thanks to the great JEDi Team :+1: 

Related FR:
- For review on client-side code submitted with this pull request:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=31875&start=0
- For review of user-interface related with this pull request (not parts of this generic code, as provided as a webapp by the server-side):
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=31874&start=0