3) This is most likely Gemfile.lock, which is the culprit, gemfile update is required forever, and it should not be updated every time.
I will try manually just to install the package on the server and see what happens, maybe you do not have the package file in a permanent location for capistrano? You can also try just adding net-scp to your Gemfile for a quick fix.
On my production server, it looks like this:
user@prodmachine :/var/www/railsapp/current/.bundle
2) start-up time, assembly and installation of the corrected 1.9.2 to obtain accelerated file downloads:
http://www.rubyinside.com/get-edge-ruby-faster-loading-ruby-1-9-2-now-4973.html
You can also install ruby-1.9.2-p290 to get acceleration when downloading files that are not as sharp.
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