remove attempt at bond support from pry and move to `pry-bond` project.

https://github.com/johnny5-/pry-bond project adds the enable-bond! and disable-bond! commands,
as well as other features, that enhance the pry&bond experience and make it easier to use and
setup without a manual effort.

see #1165
closes #1160

Gemfile

@@ -17,7 +17,6 @@ end
 
 group :development, :test do
   gem 'simplecov', '~> 0.8'
-  gem 'bond',  '~> 0.5'
 end
 
 platform :rbx do

lib/pry/bond_completer.rb

@@ -1,17 +0,0 @@
-module Pry::BondCompleter
-  def self.call(input, options)
-    Pry.current[:pry] = options[:pry]
-    Bond.agent.call(input)
-  end
-
-  def self.start
-    Bond.start(:eval_binding => lambda{ Pry.current[:pry] && Pry.current[:pry].current_context })
-    Bond.complete(:on => /\A/) do |input|
-      Pry.commands.complete(input.line,
-                            :pry_instance => Pry.current[:pry],
-                            :target       => Pry.current[:pry].current_context,
-                            :command_set  => Pry.current[:pry].commands)
-    end
-    self
-  end
-end

lib/pry/config/default.rb

@@ -35,7 +35,10 @@ class Pry::Config::Default
     :extra_sticky_locals    => proc { {} },
     :command_completions    => proc { proc { commands.keys } },
     :file_completions       => proc { proc { Dir["."] } },
-    :completer              => proc { lazy_completer }
+    :completer              => proc {
+      require "pry/input_completer"
+      Pry::InputCompleter.start
+    }
   }
 
   def initialize
@@ -113,16 +116,6 @@ private
     raise
   end
 
-  def lazy_completer
-    if defined?(Bond) && !is_editline?(input)
-      require "pry/bond_completer" unless defined?(Pry::BondCompleter)
-      Pry::BondCompleter.start
-    else
-      require "pry/input_completer" unless defined?(Pry::InputCompleter)
-      Pry::InputCompleter.start
-    end
-  end
-
   def is_editline?(input)
     defined?(input::VERSION) && input::VERSION =~ /editline/i
   end

spec/completion_spec.rb

@@ -5,24 +5,6 @@ def completer_test(bind, pry=nil, assert_flag=true)
     Pry::InputCompleter.call(symbol[0..-2], :target => Pry.binding_for(bind), :pry => pry).include?(symbol).should  == assert_flag}
   return proc {|*symbols| symbols.each(&test) }
 end
-
-require "pry/bond_completer"
-describe Pry::BondCompleter do
-  before do
-    @local = Pry::Config.new Pry::Config::Default.new
-    @local.completer
-  end
-
-  it "should use Bond if it's available" do
-    if defined?(Bond) && defined?(Readline) && Readline::VERSION !~ /editline/i
-      @local.completer.should == Pry::BondCompleter
-    else
-      @local.completer.should == Pry::InputCompleter
-    end
-  end
-end
-
-
 require "pry/input_completer"
 describe Pry::InputCompleter do
   before do