use travis ci to deploy npm packages from tags

closes #351

.travis.yml

@@ -1,9 +1,17 @@
 language: node_js
 node_js:
-  - "0.8"
-  - "0.10"
-script: "./run_tests.sh"
+- '0.8'
+- '0.10'
+script: ./run_tests.sh
 notifications:
   email: false
   irc:
-    - "irc.freenode.org#statsd"
+  - irc.freenode.org#statsd
+deploy:
+  provider: npm
+  email: d@unwiredcouch.com
+  api_key:
+    secure: IE9nz50eZsRL1Dbcxj2eY0apO1Io2swGF3ezZCzny20WgqQXiiVs24rHUi1GywDELGDc7+Vp0zJfmXigE+zTMvx0N3fTASiuDzd3C7fULa4JUSH2DoHNOXx7WSkr4EmujDsB7y1mEBDHOdBlLWBRApExt67TlYzvZiT8/Sffq3k=
+  on:
+    tags: true
+    repo: etsy/statsd