gistfile1.rb

  Configurable is a mixin intended for internal use within the SDK.
  
  It provides a suite of helper methods to objects that use the scoped configuration
  system within the root Videojuicer module.
  
  Objects that are Configurable have a local configuration, which will always be 
  respected, and a shared configuration object which merges the current configuration
  scope with the local configuration.
  
  For instance:
  
    # Assuming that the Videojuicer default configuration is a simple hash containing {:in_a_scope=>false}
  
    a_configurable.configure! :foo=>"bar" # config[:foo] will ALWAYS == "bar" for this object.
    a_configurable.local_config #=> {:foo=>"bar"}
    a_configurable.config #=> {:in_a_scope=>false, :foo=>"bar"}
    
    # Now let's enter a scope:
    Videojuicer.enter_scope :in_a_scope=>true, :foo=>"not bar"
    
    a_configurable.local_config #=> {:foo=>"bar"}
    a_configurable.config #=> {:in_a_scope=>true, :foo=>"bar"}
    
    # And leave it again..
    Videojuicer.exit_scope
    
    a_configurable.local_config #=> {:foo=>"bar"}
    a_configurable.config #=> {:in_a_scope=>false, :foo=>"bar"}