Revert "Remove sauce labs from Travis"

This reverts commit 4b365e5.

Author: dchest

.travis.yml

@@ -2,6 +2,10 @@ sudo: false
 language: node_js
 node_js:
   - "stable"
+env:
+  global:
+    - secure: VcbU15zJn1haBDK2w1FbEGhRLsDbwJ52p2Kd2cLWEpXwUAzAAwFDYzxQSD6aDUEnM25RvM78kCDv2yxKONhTXDMR5qgNGLUYnu3fG+TWhuNLVWVDzJO0Y4y0m7C1ONl0G7ILEfxMKhroptuKiha0yRExK2JZKos/j32hSdoke0A=
+    - secure: YD3KPer1EjaI2E1b11RFKhJGMc4FQtdzANFh0JyurcfOhahCuPBlS/lqEU+POlcb7qHsNKkHUkcJVXgBK7ncBxqxCqfiTAYMoxZCC62kB9+ZCeV73zFyhm+1p6y0Dnv9uh1b06z0/YzVEHt1NmVafm40U+2cBRERyViwDQLMidM=
 cache:
   directories:
     - node_modules
@@ -10,3 +14,4 @@ before_script:
 script:
   - grunt build
   - grunt test_and_coveralls
+  - travis_wait grunt saucelabs || true