Upgrade jest, fix automocking

For some reason the recast node module was mocked, even though it was
listed as not to mock. Adding `node_modules` fixed that.

Author: fkling

.travis.yml

@@ -1,4 +1,5 @@
 sudo: false
 language: node_js
 node_js:
-  - "4"
+  - 4
+  - stable

package.json

@@ -34,7 +34,7 @@
   "devDependencies": {
     "babel": "^5.6.23",
     "babel-jest": "^5.3.0",
-    "jest-cli": "^0.6.1",
+    "jest-cli": "^0.8.0",
     "rimraf": "^2.3.2",
     "temp": "^0.8.1"
   },
@@ -47,6 +47,7 @@
       "src"
     ],
     "unmockedModulePathPatterns": [
+      "node_modules",
       "tests/utils",
       "recast",
       "babel",