Optimize travis config

.travis.yml

@@ -1,25 +1,20 @@
 sudo: false
 language: node_js
 node_js:
-  - "0.12"
-  - "0.11"
-  - "0.10"
-  - "0.8"
-  - "iojs-1"
-  - "iojs-2"
-script: "npm install && npm test"
+- '2'
+- '1'
+- '0.12'
+- '0.11'
+- '0.10'
+- '0.8'
 before_install:
-  - git submodule update --init --recursive
-  - ruby -e "\`npm i -g npm\` if '`npm -v`'<'2.0.0'"
+- git submodule update --init --recursive
+- ruby -e "\`npm i -g npm\` if '`npm -v`'<'2.0.0'"
 notifications:
   email:
     recipients:
-      - z@apiary.io
+    - z@apiary.io
     on_success: change
     on_failure: always
-  hipchat:
-    rooms:
-      secure: "ZRKSctculEtR03uTxeUjWxQ8lDeC3v7hJJrmPS7JDGPBlzpzlJau1NHu3Zex\nkKWmKHH29t6otZ5tAWF3THDdUssk5VbIRMCpoEEVMJeHuBZijje7nwk2JZR/\ncPwNsIZ4keaAxujh9BBWC0i+PbkrTRxhrzIHTntawInL33ZQP9Q="
-    template:
-      - '%{repository}#%{build_number} (%{branch} - %{commit} : %{author}): %{message} (<a href="%{build_url}">Details</a>/<a href="%{compare_url}">Change view</a>)'
-    format: html
+  slack:
+    secure: Kw0lRYBknqm2a+N94lfi6Jo9941yYjsmCvNOnrjlsinTjlN47Yog0va97/3OWflz+LbAZ5dJgeIK2/XvDqDNppynjDdJJikAM5G7OAWCzwmF8u97PONLLL9CnQECF9ZC8j4jIpnkSPPrJCor02EbJA9Uz7wjscrEjT7Dd529TP0=