Bug 1206670 - Pin packages in devDependencies to explicit versions

To avoid Travis failing if new package authors don't follow semver and
break things in a point release.

This is effectively a no-op, compared to a clean install using the prior
package.json.

package.json

@@ -20,12 +20,12 @@
   "devDependencies": {
     "grunt-eslint": "16.0.0",
     "grunt-html-angular-validate": "0.4.1",
-    "karma": "~0.12.0",
-    "karma-coverage": ">=0.2.0",
-    "karma-firefox-launcher": ">=0.1.3",
+    "karma": "0.12.37",
+    "karma-coverage": "0.5.2",
+    "karma-firefox-launcher": "0.1.6",
     "karma-jasmine": "0.1.0",
-    "karma-junit-reporter": ">=0.2.1",
-    "karma-ng-scenario": ">=0.1.0"
+    "karma-junit-reporter": "0.3.4",
+    "karma-ng-scenario": "0.1.0"
   },
   "scripts": {
     "test": "karma start tests/ui/config/karma.conf.js --single-run --browsers Firefox"