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/Segments/syntastic.vim

@@ -1,5 +0,0 @@
-let g:Powerline#Segments#syntastic#segments = Pl#Segment#Init(['syntastic',
-	\ (exists('g:loaded_syntastic_plugin') && g:loaded_syntastic_plugin == 1),
-	\
-	\ Pl#Segment#Create('errors', '%{Powerline#Functions#syntastic#GetErrors("$LINE")}', Pl#Segment#Modes('!N'))
-\ ])