/usr/local/rvm/rubies/ruby-2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/dependency.rb:298:in `to_specs': Could not find 'unicorn' (>= 0) among 14 total gem(s) (Gem::LoadError)
	from /usr/local/rvm/rubies/ruby-2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/dependency.rb:309:in `to_spec'
	from /usr/local/rvm/rubies/ruby-2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:53:in `gem'
	from /usr/local/rvm/gems/ruby-2.1.2/bin/unicorn:22:in `<main>'
	from /usr/local/rvm/gems/ruby-2.1.2/bin/ruby_executable_hooks:15:in `eval'
	from /usr/local/rvm/gems/ruby-2.1.2/bin/ruby_executable_hooks:15:in `<main>'