Update README.md

- Updated the rails cmd to reflect what is happening in config/puma.rb. (It overrides whatever you pass to the puma command).
- Updated output to what's running in my machine.
- MRI 2.1.2
Update README.md

Using 4 Workers.
Update README.md

Removed some puma output.
Merge pull request #2 from goyox86/master

Updated README.md