[wp-trac] [WordPress Trac] #30823: Update npm on travis

[WordPress Trac]

#30823: Update npm on travis
------------------------------+-----------------
 Reporter:  jorbin            |      Owner:
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  4.2
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
  Focuses:                    |
------------------------------+-----------------
 Travis CI containers have an out of date version of NPM on it. We should
 update it as a part of our build.

 It currently generates a warning that is hidden by default

 {{{
  npm WARN engine imagemin at 3.1.0: wanted:
 {"node":">=0.10.0","npm":">=2.1.5"} (current:
 {"node":"0.10.33","npm":"1.4.28"})
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/30823>
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