NOJIRA Move "rails" script to Rails 4 directory

According to http://guides.rubyonrails.org/4_0_release_notes.html the app executables belong in "bin" instead of "script".
The command line wrapper falls back to "script/rails" if "bin/rails" is missing, but RubyMine isn't so ingenious. Running the Rails server from inside the IDE fails when the script isn't found in the standard location.