Add yadr command line tools to remove/list plugins

Two new command line tools: yadr-vim-remove-plugin and
yadr-vim-list-plugin do what they're supposed to.

bin/yadr/yadr-vim-list-plugin

@@ -0,0 +1,21 @@
+#!/usr/bin/env ruby
+require File.join(File.dirname(__FILE__), 'default_libs')
+require File.join(File.dirname(__FILE__), 'vundle')
+
+GitStyleBinary.command do
+  version "yadr-list-vim-plugin 1.0"
+
+  short_desc "List installed vim plugins"
+
+  banner <<-'EOS'
+      Usage: yadr-list-vim-plugin
+  EOS
+  run do |command|
+    puts "Currently configured plugins:" 
+    i=1
+    Vundle::vundle_list.each do |plugin|
+      puts "#{i}. #{plugin}"
+      i=i+1
+    end
+  end
+end