* Prevent multiple plugin registrations of the same name

  * Prevent multiple plugin registrations of the same name
	* reworking the config system to use yaml for persistence
	* reworking the config system key names
	* on first startup, the bot will prompt for the essential startup config
	* new config module for configuring the bot at runtime
	* new config module includes new configurables, for example changing the
   	bot's language at runtime.
	* various other fixes
	* New way of mapping plugins to strings, using maps. These may be
	familiar to rails users. This is to reduce the amount of regexps plugins
	currently need to do to parse arguments. The old method (privmsg) is still
	supported, of course. Example plugin now:
	  def MyPlugin < Plugin
		  def foo(m, params)
			  m.reply "bar"
			end

			def complexfoo(m, params)
			  m.reply "qux! (#{params[:bar]} #{params[:baz]})"
			end
		end
		plugin = MyPlugin.new
		# simple map
		plugin.map 'foo'

    # this will match "rbot: foo somestring otherstring" and pass the
		# parameters as a hash using the names in the map.
		plugin.map 'foo :bar :baz', :action => 'complexfoo'
		# this means :foo is an optional parameter
		plugin.map 'foo :foo', :defaults => {:foo => 'bar'}
    # you can also gobble up into an array
		plugin.map 'foo *bar' # params[:bar] will be an array of string elements
    # and you can validate, here the first param must be a number
		plugin.map 'foo :bar', :requirements => {:foo => /^\d+$/}