Add npm update mechanism for SFDC plugins

package.json

@@ -1,7 +1,7 @@
 {
     "name": "c9",
     "description": "New Cloud9 Client",
-    "version": "3.0.1",
+    "version": "3.0.2317",
     "author": "Ajax.org B.V. <info@ajax.org>",
     "private": true,
     "main": "bin/c9",

plugins/c9.nodeapi/semver-compare.js

@@ -0,0 +1,39 @@
+// semver-compare (1.0.0)
+// https://github.com/substack/semver-compare
+//
+// This software is released under the MIT license:
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+define(function(require, exports, module) {
+
+module.exports = function cmp (a, b) {
+    var pa = a.split('.');
+    var pb = b.split('.');
+    for (var i = 0; i < 3; i++) {
+        var na = Number(pa[i]);
+        var nb = Number(pb[i]);
+        if (na > nb) return 1;
+        if (nb > na) return -1;
+        if (!isNaN(na) && isNaN(nb)) return 1;
+        if (isNaN(na) && !isNaN(nb)) return -1;
+    }
+    return 0;
+};
+
+});