upgrade devDependencies

package.json

@@ -6,20 +6,20 @@
     "url": "https://github.com/arshaw/fullcalendar.git"
   },
   "devDependencies": {
-    "underscore": "~1.4.4",
-    "grunt": "~0.4.0",
-    "grunt-contrib-concat": "~0.1.2",
-    "grunt-contrib-uglify": "~0.1.1",
-    "grunt-contrib-copy": "~0.4.0",
-    "grunt-contrib-compress": "~0.4.0",
-    "grunt-contrib-clean": "~0.4.0",
-    "grunt-contrib-jshint": "~0.8.0",
-    "grunt-jscs-checker": "~0.3.2",
+    "underscore": "^1.4.4",
+    "grunt": "^0.4.5",
+    "grunt-contrib-concat": "^0.1.3",
+    "grunt-contrib-uglify": "^0.1.2",
+    "grunt-contrib-copy": "^0.4.1",
+    "grunt-contrib-compress": "^0.4.10",
+    "grunt-contrib-clean": "^0.4.1",
+    "grunt-contrib-jshint": "^0.8.0",
+    "grunt-jscs-checker": "^0.3.2",
     "grunt-karma": "^0.8.3",
-    "lumbar": "~2.0.0-beta19",
-    "karma": "^0.12.1",
+    "lumbar": "^2.0.1",
+    "karma": "^0.12.16",
     "karma-jasmine": "^0.2.2",
-    "karma-phantomjs-launcher": "^0.1.2"
+    "karma-phantomjs-launcher": "^0.1.4"
   },
   "scripts": {
     "install": "bower install"