Added option that disables addon-info handlers

(it would be nicer to remove them completely:
 1. there is no addon-info filetype, nobody did provide ftplugin script
 2. since we now allow 'scalar' (in order to use string() and not to write our
    own variable dumper), it is no more JSON
 3. even if it was JSON there is no json syntax in standart distribution, only
    for JSON-compatible YAML (main reason: I do not want to fight VAM about who
    will set filetype)
 4. filetype detection should be done in ftdetect script, not here
 5. syntax is not a business of autoload plugin, especially if it is refered as
    “addon manager”)

autoload/vam.vim

@@ -6,15 +6,6 @@
 
 " don't need a plugin. If you want to use this plugin you call Activate once
 " anyway
-augroup VAM_addon_info_handlers
-  autocmd!
-  autocmd BufRead,BufNewFile *-addon-info.txt,addon-info.json
-    \ setlocal ft=addon-info
-    \ | setlocal syntax=json
-    \ | syn match Error "^\s*'"
-  autocmd BufWritePost *-addon-info.txt,addon-info.json call vam#ReadAddonInfo(expand('%'))
-augroup end
-
 fun! vam#DefineAndBind(local,global,default)
   return 'if !exists('.string(a:global).') | let '.a:global.' = '.a:default.' | endif | let '.a:local.' = '.a:global
 endf
@@ -70,6 +61,19 @@ else
   let s:c['plugin_sources']["vim-addon-manager-known-repositories"] = { 'type' : 'archive', 'url': 'http://github.com/MarcWeber/vim-addon-manager-known-repositories/tarball/master', 'archive_name': 'vim-addon-manager-known-repositories-tip.tar.gz' }
 endif
 
+let s:c['create_addon_info_handlers'] = get(s:c, 'create_addon_info_handlers', 1)
+
+if s:c.create_addon_info_handlers
+  augroup VAM_addon_info_handlers
+    autocmd!
+    autocmd BufRead,BufNewFile *-addon-info.txt,addon-info.json
+      \ setlocal ft=addon-info
+      \ | setlocal syntax=json
+      \ | syn match Error "^\s*'"
+    autocmd BufWritePost *-addon-info.txt,addon-info.json call vam#ReadAddonInfo(expand('%'))
+  augroup END
+endif
+
 fun! vam#VerifyIsJSON(s)
   " You must allow single-quoted strings in order for writefile([string()]) that 
   " adds missing addon information to work