Merge pull request #14374 from emberjs/cache-caches

Cache the caches to avoid some npm bizarreness when bumping packages.

Author: rwjblue

.travis.yml

@@ -10,8 +10,8 @@ addons:
 
 cache:
   directories:
-    - node_modules
-    - bower_components
+    - $HOME/.npm
+    - $HOME/.cache # includes bowers cache
 
 before_install:
   - "npm config set spin false"