Updating Travis file

Author: mattpodwysocki

.travis.yml

@@ -1,4 +1,14 @@
 language: node_js
 node_js:
-  - "0.11"
-  - "0.10"
+  - "0.10"
+  - "0.12"
+  - 4
+  - iojs
+notifications:
+  slack: reactivex:e424dAgQ2W9kuRMe6ngxHQbv
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/8f1482d7420d95b647ce
+    on_success: change  # options: [always|never|change] default: always
+    on_failure: always  # options: [always|never|change] default: always
+    on_start: false     # default: false