Fix preferred completion handling w/caching

package.json

@@ -55,7 +55,7 @@
         "c9"
     ],
     "c9plugins": {
-        "c9.ide.language": "#73e6ceb356",
+        "c9.ide.language": "#e00bbe7231",
         "c9.ide.language.css": "#36150db526",
         "c9.ide.language.generic": "#365368d108",
         "c9.ide.language.html": "#e7b5ab7ff8",

server.js

@@ -205,4 +205,4 @@ function start(configName, options, callback) {
                 plugin.name = name; 
         });
     });
-}
+}