Rip out internal connection pooling.

We do not need to guarantee thread affinity so the complexity of the
internal connection pool and reaper is no longer needed. We simply now
just use the connection_pool gem.

lib/moped/connection.rb

@@ -1,8 +1,5 @@
 # encoding: utf-8
 require "moped/connection/manager"
-require "moped/connection/pool"
-require "moped/connection/queue"
-require "moped/connection/reaper"
 require "moped/connection/sockets"
 
 module Moped

lib/moped/connection/manager.rb

@@ -1,4 +1,6 @@
 # encoding: utf-8
+require "connection_pool"
+
 module Moped
   class Connection
 
@@ -11,6 +13,12 @@ module Manager
       # Used for synchronization of pools access.
       MUTEX = Mutex.new
 
+      # The default max size for the connection pool.
+      POOL_SIZE = 5
+
+      # The default timeout for getting connections from the queue.
+      TIMEOUT = 0.5
+
       # Get a connection pool for the provided node.
       #
       # @example Get a connection pool for the node.
@@ -23,13 +31,38 @@ module Manager
       # @since 2.0.0
       def pool(node)
         MUTEX.synchronize do
-          pools[node.address.resolved] ||=
-            Pool.new(node.address.ip, node.address.port, node.options)
+          pools[node.address.resolved] ||= create_pool(node)
         end
       end
 
       private
 
+      # Create a new connection pool for the provided node.
+      #
+      # @api private
+      #
+      # @example Get a connection pool for the node.
+      #   Manager.create_pool(node)
+      #
+      # @param [ Node ] node The node.
+      #
+      # @return [ ConnectionPool ] A connection pool.
+      #
+      # @since 2.0.0
+      def create_pool(node)
+        ConnectionPool.new(
+          size: node.options[:pool_size] || POOL_SIZE,
+          timeout: node.options[:pool_timeout] || TIMEOUT
+        ) do
+          Connection.new(
+            node.address.ip,
+            node.address.port,
+            node.options[:timeout] || Connection::TIMEOUT,
+            node.options
+          )
+        end
+      end
+
       # Get all the connection pools. This is a cache that stores each pool
       # with lookup by it's resolved address.
       #