Add cp command and copy api endpoint

The cp command and copy api endpoint allows users
to copy files and or folders from a containers filesystem.

Closes #382

docs/sources/api/docker_remote_api_v1.3.rst

@@ -525,6 +525,38 @@ Remove a container
         :statuscode 500: server error
 
 
+Copy files or folders from a container
+**************************************
+
+.. http:post:: /containers/(id)/copy
+
+	Copy files or folders of container ``id``
+
+	**Example request**:
+
+	.. sourcecode:: http
+
+	   POST /containers/4fa6e0f0c678/copy HTTP/1.1
+	   Content-Type: application/json
+
+	   {
+		"Resource":"test.txt"
+	   }
+
+	**Example response**:
+
+	.. sourcecode:: http
+
+	   HTTP/1.1 200 OK
+	   Content-Type: application/octet-stream
+	   
+	   {{ STREAM }}
+
+	:statuscode 200: no error
+	:statuscode 404: no such container
+	:statuscode 500: server error
+
+
 2.2 Images
 ----------
 
@@ -1091,7 +1123,6 @@ Monitor Docker's events
         :statuscode 200: no error
         :statuscode 500: server error
 
-
 3. Going further
 ================
 

docs/sources/commandline/cli.rst

@@ -30,6 +30,7 @@ Available Commands
    command/attach
    command/build
    command/commit
+   command/cp
    command/diff
    command/export
    command/history

docs/sources/commandline/command/cp.rst

@@ -0,0 +1,13 @@
+:title: Cp Command
+:description: Copy files/folders from the containers filesystem to the host path
+:keywords: cp, docker, container, documentation, copy
+
+===========================================================
+``cp`` -- Copy files/folders from the containers filesystem to the host path
+===========================================================
+
+::
+
+    Usage: docker cp CONTAINER:RESOURCE HOSTPATH
+
+    Copy files/folders from the containers filesystem to the host path.  Paths are relative to the root of the filesystem.

docs/sources/commandline/index.rst

@@ -15,6 +15,7 @@ Contents:
   attach  <command/attach>
   build   <command/build>
   commit  <command/commit>
+  cp      <command/cp>
   diff    <command/diff>
   export  <command/export>
   history <command/history>