I think I found the reason for travis' complaining.

476fae13 · JC Brand · bc0e200c · 476fae13
Commit 476fae13 authored Aug 24, 2013 by JC Brand
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.travis.yml .travis.yml +1 -1

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--- a/.travis.yml
+++ b/.travis.yml
@@ -2,5 +2,5 @@ language: node_js
 node_js:
 - "0.10"
 before_script:
- - "./node_modules/.bin/bower update"
+ - "./node_modules/.bin/grunt fetch"
 script: grunt test