bump up to jQuery 2.0 and start using bower for managing dependencies

.bowerrc

@@ -0,0 +1,4 @@
+{
+  "directory": "libs",
+  "json": "bower.json"
+}

bower.json

@@ -0,0 +1,8 @@
+{
+  "devDependencies": {
+    "qunit": "~1.11.0"
+  },
+  "dependencies": {
+    "jquery": "~2.0.0"
+  }
+}

package.json

@@ -21,9 +21,6 @@
       "url": "https://github.com/ducksboard/gridster.js/blob/master/LICENSE"
     }
   ],
-  "dependencies": {
-    "jquery": "~1.5"
-  },
   "keywords": [],
   "devDependencies": {
     "grunt": "~0.4.1",