[GitHub] zeppelin issue #2042: [ZEPPELIN-1588]: bumping nvd3 to 1.8.5

[Leemoonsoo]

Github user Leemoonsoo commented on the issue:

    https://github.com/apache/zeppelin/pull/2042
  
    Master branch is still being built by ASF's travis account and it's failing 
after this PR merged.
    
    
![image](https://cloud.githubusercontent.com/assets/1540981/23637927/dfbfb746-0321-11e7-9255-bbb6b7c23b59.png)
    
    I think we need to merge a code that clear `bower_components` from the 
cache automatically when it is invalid.


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