Move plugins to powerline directory

MANIFEST.in

@@ -1,3 +1,2 @@
-recursive-include powerline *.json
-recursive-include plugin *.vim
+recursive-include powerline *.json *.vim
 exclude powerline/tests/*.xml

powerline/plugin/vim/powerline.vim

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