Re-name the main Foreman::Engine method to #run to avoid a name collision with #start(name)

lib/foreman/cli.rb

@@ -30,7 +30,7 @@ class Foreman::CLI < Thor
   def start(process=nil)
     check_procfile!
     engine.options[:concurrency] = "#{process}=1" if process
-    engine.start
+    engine.run
   end
 
   desc "export FORMAT LOCATION", "Export the application to another process management format"

lib/foreman/engine.rb

@@ -28,7 +28,7 @@ class Foreman::Engine
     @output_mutex = Mutex.new
   end
 
-  def start
+  def run
     proctitle "ruby: foreman master"
     termtitle "#{File.basename(@directory)} - foreman"