Revert "shrinkwrap for faster tests"

This reverts commit cf8fc50.

Unfortunately breaks travis :(

Author: leebyron

.travis.yml

@@ -8,10 +8,6 @@ node_js:
   - "0.12"
   - "0.10"
 
-cache:
-  directories:
-    - node_modules
-
 before_install:
   - npm config set spin false --global