Updated all plugins that are non-forked. Added some new plugins.

Added update_plugins.py which can fetch new plugins from GitHub.

New plugins added: zencoding, vim-indent-object, taglist, nginx.vim

sources_non_forked/vim-powerline/autoload/Powerline/Functions/fugitive.vim

@@ -1,7 +0,0 @@
-function! Powerline#Functions#fugitive#GetBranch(symbol) " {{{
-	let ret = fugitive#statusline()
-
-	let ret = substitute(ret, '\c\v\[?GIT\(([a-z0-9\-_\./:]+)\)\]?', a:symbol .' \1', 'g')
-
-	return ret
-endfunction " }}}