Fixes many small UX issues. Implements object proxies to keep state across usage (filter, results)

package.json

@@ -91,7 +91,7 @@
         "c9.ide.immediate": "#6845a93705",
         "c9.ide.installer": "#be8d9aa07c",
         "c9.ide.mount": "#816dbe987b",
-        "c9.ide.navigate": "#dcb08387ae",
+        "c9.ide.navigate": "#6a1c2e253c",
         "c9.ide.newresource": "#f1f0624768",
         "c9.ide.openfiles": "#28a4f5af16",
         "c9.ide.preview": "#c530a7978d",

plugins/c9.ide.tree/style.css

@@ -9,7 +9,7 @@
     background : transparent;
     color : @color;
     border-radius: 3px;
-    margin: 1px 0px 0px 10px;
+    margin: 0px 0px 0px 10px;
     padding-left: 6px;
     height: @tree-row-height;
 }