Ruby 2.0.0
Add Procfile
Ruby 2.0.0: Puma Hybrid Model: 3 Multi-Threaded Workers
Start from scratch

Ruby 2.0.0: Puma threaded
Ruby 2.0.0: Puma Hybrid Model: 3 Multi-Threaded Workers
Ruby 2.0.0: Puma, hybrid *4* workers, multi-threaded
JRuby 1.7.4: Puma threaded
Let's try Puma 2.0.1 because 2.2.2 doesn't work with JRuby

JRuby 1.7.4: Puma threaded
Back to puma 2.2.2
JRuby 1.7.4: Puma Hybrid Model: 3 Multi-Threaded Workers
Puma doesn't support workers on JRuby and Windows