Travis: fix failing tests + update dependencies (#335)

* Make unify script recursive + clean up dependency conflicts

* Restore travis.yml

* Delete outdated text detection sample that duplicates detect.js

* Fix failing KMS + vision tests by updating dependencies

* Fix video tests using a bad cwd

* Upgrade monitoring dependency + skip flaky monitoring tests

* Fix DLP tests having wrong cwd

* Fix failing vision test

* Fix datastore tests

* Update broken dependency

* Update possibly broken compute engine dependency

* Fix typos

* Disable Node 4 testing

* Revert deletion of outdated sample - @gguuss says we still use this.

This reverts commit b7259c820fb011369c7b5badac82fcde26be008a.

* Update dependency

packages/google-cloud-compute/samples/package.json

@@ -9,8 +9,8 @@
     "system-test": "cd ..; npm run t -- computeengine/system-test/*.test.js"
   },
   "dependencies": {
-    "@google-cloud/compute": "0.5.0",
-    "googleapis": "16.1.0",
+    "@google-cloud/compute": "0.6.0",
+    "googleapis": "18.0.0",
     "nodemailer": "2.7.0",
     "nodemailer-smtp-transport": "2.7.2",
     "sendgrid": "4.7.1"