use tab.meta instead of adding tab.debugData

package.json

@@ -67,7 +67,7 @@
         "c9.ide.language.javascript.tern": "#2b0bb024da",
         "c9.ide.language.javascript.infer": "#cfec494a3c",
         "c9.ide.language.jsonalyzer": "#ba3e0d298c",
-        "c9.ide.collab": "#234c59a8e9",
+        "c9.ide.collab": "#c98b539847",
         "c9.ide.local": "#a9703b630c",
         "c9.ide.find": "#6cc6d3379d",
         "c9.ide.find.infiles": "#72582de3cd",

plugins/c9.ide.editors/tab.js

@@ -15,7 +15,6 @@ define(function(require, module, exports) {
                 title, tooltip, amlTab, closed, rule, docInited;
                 
             var meta = {};
-            var debugData = {};
             var name = options.name;
             
             var classList = {
@@ -356,13 +355,6 @@ define(function(require, module, exports) {
                  * @property {Object} meta
                  */
                 get meta(){ return meta; },
-                
-                /**
-                 * Data for debugging issues and errors with tabs 
-                 * @property {Object} debugData
-                 */
-                get debugData(){ return debugData; },
-                
                 /** 
                  * The path to the file loaded into this tab. This property will
                  * be undefined when no path is set (for instance when no file