Try and upgrade npm in travis

mattrobenolt · mattrobenolt · commit a50eaa5db167 · 2014-05-19T09:29:53.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,3 +4,5 @@ node_js:
   - "0.8"
   - "0.10"
   - "0.11"
+install:
+    - "npm install --upgrade npm -g"
