Move vim plugin to the vim extension directory

docs/source/overview.rst

@@ -36,7 +36,7 @@ Vim usage
 If Powerline is installed as a system-wide Python package, you can enable 
 the plugin by adding the following line to your ``vimrc``::
 
-    python import powerline.plugin.vim.load_vim_plugin
+    python from powerline.ext.vim import source_plugin; source_plugin()
 
 If Powerline is installed outside Python's search path (e.g. by having the 
 git repo in your dotfiles folder) you'll have to source the vim plugin file 
@@ -45,4 +45,4 @@ with an absolute path to the plugin location.
 Add the following line to your ``vimrc``, where ``{path}`` is the path to 
 the main Powerline project folder::
 
-    source {path}/powerline/plugin/vim/powerline.vim
+    source {path}/powerline/ext/vim/powerline.vim

powerline/ext/vim/__init__.py

@@ -1 +1,7 @@
-from renderer import VimRenderer  # NOQA
+# -*- coding: utf-8 -*-
+
+def source_plugin():
+	import os
+	import vim
+
+	vim.command('source ' + os.path.join(os.path.abspath(os.path.dirname(__file__)), 'powerline.vim'))

powerline/ext/vim/powerline.vim

@@ -1,10 +1,3 @@
-" Powerline vim plugin
-"
-" If Powerline is installed in a Python search path, load the plugin by
-" adding the following line to your .vimrc:
-"
-" python import powerline.plugin.vim.load_vim_plugin
-
 python import sys, vim, os
 python sys.path.append(vim.eval('expand("<sfile>:h:h:h:h")'))
 python import uuid

powerline/plugin/vim/load_vim_plugin.py

@@ -1,4 +0,0 @@
-import os
-import vim
-
-vim.command('source ' + os.path.join(os.path.abspath(os.path.dirname(__file__)), 'powerline.vim'))