Update devDependencies.

package.json

@@ -26,29 +26,29 @@
     "test": "grunt test"
   },
   "devDependencies": {
-    "grunt": "~0.4.5",
-    "grunt-autoprefixer": "~3.0.0",
-    "grunt-banner": "~0.6.0",
-    "grunt-contrib-clean": "~1.0.0",
-    "grunt-contrib-compress": "~1.0.0",
-    "grunt-contrib-concat": "~0.5.1",
-    "grunt-contrib-connect": "~0.11.2",
-    "grunt-contrib-copy": "~0.8.0",
-    "grunt-contrib-csslint": "~0.5.0",
-    "grunt-contrib-cssmin": "~0.14.0",
-    "grunt-contrib-htmlmin": "~0.6.0",
-    "grunt-contrib-jshint": "~1.0.0",
-    "grunt-contrib-uglify": "~0.11.0",
-    "grunt-contrib-watch": "~0.6.1",
-    "grunt-csscomb": "~3.1.0",
-    "grunt-html": "~6.0.0",
-    "grunt-contrib-jasmine": "~1.0.0",
-    "grunt-jekyll": "~0.4.2",
-    "grunt-jscs": "~2.7.0",
-    "grunt-sass": "~1.1.0",
+    "grunt": "^0.4.5",
+    "grunt-autoprefixer": "^3.0.0",
+    "grunt-banner": "^0.6.0",
+    "grunt-contrib-clean": "^1.0.0",
+    "grunt-contrib-compress": "^1.1.0",
+    "grunt-contrib-concat": "^1.0.0",
+    "grunt-contrib-connect": "^1.0.0",
+    "grunt-contrib-copy": "^1.0.0",
+    "grunt-contrib-csslint": "^1.0.0",
+    "grunt-contrib-cssmin": "^1.0.0",
+    "grunt-contrib-htmlmin": "^1.0.0",
+    "grunt-contrib-jshint": "^1.0.0",
+    "grunt-contrib-uglify": "^1.0.0",
+    "grunt-contrib-watch": "^0.6.1",
+    "grunt-csscomb": "^3.1.0",
+    "grunt-html": "^6.0.0",
+    "grunt-contrib-jasmine": "^1.0.0",
+    "grunt-jekyll": "^0.4.2",
+    "grunt-jscs": "^2.8.0",
+    "grunt-sass": "^1.1.0",
     "grunt-sed": "twbs/grunt-sed#v0.2.0",
-    "load-grunt-tasks": "~3.4.0",
-    "time-grunt": "~1.3.0"
+    "load-grunt-tasks": "^3.4.0",
+    "time-grunt": "^1.3.0"
   },
   "engines": {
     "node": ">=0.10.1"