chore(travis): cleanup travis.yml

Author: vicb

.travis.yml

@@ -2,7 +2,7 @@ language: node_js
 node_js:
 - '0.10'
 env:
-  stable:
+  global:
   - CHANNEL=stable
   - BROWSERS=DartiumWithWebPlatform
   - LOGS_DIR=/tmp/angular-build/logs
@@ -17,4 +17,4 @@ before_script:
 script:
 - ./scripts/travis/build.sh
 after_script:
-- ./scripts/travis/print-logs.sh
+- ./scripts/travis/print-logs.sh