Add Jest test to check dependency version matches.

Reviewed By: @vjeux

Differential Revision: D2396634

package.json

@@ -46,38 +46,38 @@
     "react-native-start": "packager/packager.sh"
   },
   "dependencies": {
-    "absolute-path": "0.0.0",
-    "babel": "5.8.23",
-    "babel-core": "5.8.23",
-    "bser": "1.0.2",
-    "chalk": "1.1.1",
-    "connect": "2.8.3",
-    "debug": "2.2.0",
-    "graceful-fs": "4.1.2",
-    "image-size": "0.3.5",
-    "immutable": "3.7.5",
-    "joi": "6.6.1",
-    "jstransform": "11.0.3",
-    "module-deps": "3.9.1",
-    "optimist": "0.6.1",
-    "progress": "1.1.8",
-    "promise": "7.0.4",
-    "react-timer-mixin": "0.13.2",
+    "absolute-path": "^0.0.0",
+    "babel": "^5.8.23",
+    "babel-core": "^5.8.23",
+    "bser": "^1.0.2",
+    "chalk": "^1.1.1",
+    "connect": "^2.8.3",
+    "debug": "^2.2.0",
+    "graceful-fs": "^4.1.2",
+    "image-size": "^0.3.5",
+    "immutable": "^3.7.5",
+    "joi": "^6.6.1",
+    "jstransform": "^11.0.3",
+    "module-deps": "^3.9.1",
+    "optimist": "^0.6.1",
+    "progress": "^1.1.8",
+    "promise": "^7.0.4",
+    "react-timer-mixin": "^0.13.2",
     "react-tools": "git://github.com/facebook/react#b4e74e38e43ac53af8acd62c78c9213be0194245",
-    "rebound": "0.0.13",
-    "regenerator": "0.8.36",
+    "rebound": "^0.0.13",
+    "regenerator": "^0.8.36",
     "sane": "^1.2.0",
-    "semver": "5.0.1",
-    "source-map": "0.4.4",
-    "stacktrace-parser": "0.1.3",
-    "uglify-js": "2.4.24",
-    "underscore": "1.8.3",
-    "wordwrap": "1.0.0",
-    "worker-farm": "1.3.1",
-    "ws": "0.8.0",
-    "yargs": "3.24.0",
-    "yeoman-environment": "1.2.7",
-    "yeoman-generator": "0.20.3"
+    "semver": "^5.0.1",
+    "source-map": "^0.4.4",
+    "stacktrace-parser": "^0.1.3",
+    "uglify-js": "^2.4.24",
+    "underscore": "^1.8.3",
+    "wordwrap": "^1.0.0",
+    "worker-farm": "^1.3.1",
+    "ws": "^0.8.0",
+    "yargs": "^3.24.0",
+    "yeoman-environment": "^1.2.7",
+    "yeoman-generator": "^0.20.3"
   },
   "devDependencies": {
     "jest-cli": "0.5.1",