Move core-object to dependencies.

1.0.0-beta.5 introduced the `lib/tasks/fastboot-server.js` task, but only added `core-object` to `devDependencies`.  Since this module is used at runtime (not just under development) it needs to be included in `dependencies`.

Also, updated the version to 2.0.5 (contains a few bug fixes).

Author: rwjblue

package.json

@@ -23,7 +23,6 @@
     "chai": "^2.2.0",
     "chai-fs": "peterkc/chai-fs#31deec5232297e2887a2ffb39b9081364c8e78e1",
     "chalk": "^1.1.1",
-    "core-object": "2.0.1",
     "cpr": "^1.1.1",
     "debug": "^2.2.0",
     "ember-cli": "^2.5.0",
@@ -69,6 +68,7 @@
     "broccoli-merge-trees": "^1.1.1",
     "broccoli-plugin": "^1.2.1",
     "broccoli-stew": "^1.2.0",
+    "core-object": "^2.0.5",
     "fastboot-express-middleware": "1.0.0-beta.8",
     "ember-cli-babel": "^5.1.5",
     "ember-test-helpers": "^0.5.22",