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-snippets/UltiSnips/README

@@ -0,0 +1,21 @@
+This directory contains the main scripts that come bundled with UltiSnips.
+
+Standing On The Shoulders of Giants
+===================================
+
+The snippets have been collected from various other project which I want to
+express my gratitude for. My main source for inspiration where the following
+two projects:
+
+   TextMate: http://svn.textmate.org/trunk/Bundles/
+   SnipMate: http://code.google.com/p/snipmate/
+
+All snippets from those sources were copied and cleaned up, so that they are 
+  - not using shell script, only python (so they are cross platform compatible)
+  - not using any feature that UltiSnips doesn't offer
+
+UltiSnips has seen contributions by various individuals. Those contributions
+have been merged into this collection seamlessly and without further comments.
+
+-- vim:ft=rst:nospell:
+