Update gems
Remove more middlewares
The parameter is still required in production so it turned out
Twitter removed their v1.0 API and thus completely disables access to tweets using RSS readers.
This application will proxy user's tweets into atom feed which solves the problem.
hg clone ...
cd ... && bundle
export ...
bin/rails s
Detailed instruction is left as an exercise unless someone step up and write one for me.
Create a config file. Read config/config_init.rb for hints.