Added shader support, removed unused debugging puts statements and fixed Gosu Font.draw deprecation warning.

lib/managers/shader_manager.rb

@@ -0,0 +1,12 @@
+class IMICFPS
+  class ShaderManager
+    SHADERS = {}
+    def self.add_shader(name, shader)
+      SHADERS[name] = shader
+    end
+
+    def self.shader(name)
+      SHADERS[name]
+    end
+  end
+end