use exact versions to avoid unpredictable crashes

possible reason behind crash when testing:
1.5.0-rc.1 fails to load in PhantomJS 1.x + Karma environment
angular/angular.js#13794

crash log:
```
PhantomJS 1.9.8 (Mac OS X 0.0.0) ERROR
  Error: [$injector:modulerr] Failed to instantiate module ng due to:
  TypeError: 'undefined' is not an object (evaluating 'Function.prototype.bind.apply')
      at ...
      at /Users/shahwarcoder/loopback-sdk-angular/test.e2e/given.js:19
```

Author: pulkitsinghal

Diff for: package.json

@@ -27,31 +27,31 @@
     "ejs": "^1.0"
   },
   "devDependencies": {
-    "angular": "^1.4.9",
-    "angular-mocks": "^1.4.9",
-    "angular-resource": "^1.4.9",
-    "bluebird": "^3.1.4",
-    "body-parser": "^1.5",
-    "chai": "^1.9",
-    "cors": "^2.2",
-    "debug": "^2.2.0",
-    "errorhandler": "^1.1.1",
-    "eslint": "^2.5.3",
-    "eslint-config-loopback": "^1.0.0",
-    "express": "^4.6",
-    "fs.extra": "^1.2",
-    "karma": "^0.13.19",
-    "karma-chrome-launcher": "^0.2.2",
-    "karma-junit-reporter": "^0.3.8",
-    "karma-mocha": "^0.2.1",
-    "karma-mocha-reporter": "^1.1.5",
-    "karma-phantomjs-launcher": "^0.2.3",
-    "karma-requirejs": "^0.2.1",
-    "loopback": "^2.0",
-    "loopback-datasource-juggler": "^2.0",
-    "mocha": "~1.18.0",
-    "morgan": "^1.2",
-    "phantomjs": "^1.9.19",
-    "requirejs": "^2.1.9"
+    "angular": "1.4.9",
+    "angular-mocks": "1.4.9",
+    "angular-resource": "1.4.9",
+    "bluebird": "3.1.4",
+    "body-parser": "1.5",
+    "chai": "1.9",
+    "cors": "2.2",
+    "debug": "2.2.0",
+    "errorhandler": "1.1.1",
+    "eslint": "2.5.3",
+    "eslint-config-loopback": "1.0.0",
+    "express": "4.6",
+    "fs.extra": "1.2",
+    "karma": "0.13.19",
+    "karma-chrome-launcher": "0.2.2",
+    "karma-junit-reporter": "0.3.8",
+    "karma-mocha": "0.2.1",
+    "karma-mocha-reporter": "1.1.5",
+    "karma-phantomjs-launcher": "0.2.3",
+    "karma-requirejs": "0.2.1",
+    "loopback": "2.0",
+    "loopback-datasource-juggler": "2.0",
+    "mocha": "1.18.0",
+    "morgan": "1.2",
+    "phantomjs": "1.9.19",
+    "requirejs": "2.1.9"
   }
 }