Update dependencies

package.json

@@ -39,14 +39,14 @@
   },
   "dependencies": {
     "chalk": "~0.5.1",
-    "mkdirp": "~0.3.5",
-    "mocha": "~1.18.2",
+    "mkdirp": "~0.5.0",
+    "mocha": "~1.21.4",
     "nan": "~1.3.0",
     "node-watch": "~0.3.4",
-    "object-assign": "^0.3.1",
-    "shelljs": "~0.2.6",
-    "sinon": "~1.9.1",
-    "node-sass-middleware": "~0.2.0",
+    "object-assign": "~1.0.0",
+    "shelljs": "~0.3.0",
+    "sinon": "~1.10.3",
+    "node-sass-middleware": "~0.3.0",
     "yargs": "~1.3.1",
     "get-stdin": "~3.0.0"
   },
@@ -56,6 +56,6 @@
     "jscoverage": "^0.5.6",
     "jshint": "^2.5.5",
     "mocha-lcov-reporter": "^0.0.1",
-    "object-assign": "^0.3.1"
+    "object-assign": "^1.0.0"
   }
 }