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/snipmate-snippets/vim/au.snippet

@@ -0,0 +1 @@
+autocmd ${1:events} ${2:pattern} ${3:command}

sources_non_forked/snipmate-snippets/vim/com.snippet

@@ -0,0 +1 @@
+command! -nargs=${1:number_of_args} ${2:other_params} ${2:name} ${2:command}

sources_non_forked/snipmate-snippets/vim/func.snippet

@@ -0,0 +1,8 @@
+"Function: $1
+"Desc: ${3:description}
+"
+"Arguments:
+"${4}
+function! ${1:name}(${2})
+	${5}
+endfunction

sources_non_forked/snipmate-snippets/vim/if.snippet

@@ -0,0 +1,3 @@
+if ${1}
+	${2}
+endif

sources_non_forked/snipmate-snippets/vim/ife.snippet

@@ -0,0 +1,4 @@
+if ${1}
+	${2}
+else
+endif

sources_non_forked/snipmate-snippets/vim/log.snippet

@@ -0,0 +1 @@
+echomsg ${1}

sources_non_forked/snipmate-snippets/vim/try.snippet

@@ -0,0 +1,4 @@
+try
+	${2}
+catch /${1}/
+endtry