update .travis.yml (nvm works on travis now)

.travis.yml

@@ -1,30 +1,14 @@
-language: c
+language: node_js
 
 before_install:
-  - rm -rf ~/.nvm
-  - wget https://raw.githubusercontent.com/visionmedia/n/master/bin/n -qO n
-  - chmod +x n
-  - sudo cp n /usr/local/bin/n
-  - sudo chmod -R a+xw /usr/local
-  - n --version
+  - export JOBS=max
 
-script:
-  - n 0.10
-  - node -v; which node; npm -v; which npm
-  - JOBS=max npm install
-  - npm test && rm -rf node_modules/
-
-  - n latest
-  - node -v; which node; npm -v; which npm
-  - JOBS=max npm install
-  - npm test && rm -rf node_modules/
+node_js:
+  - "2.0.0"
+  - "1.8.1"
+  - "0.12"
+  - "0.10"
 
-  - n io latest
-  - iojs -v; which iojs; npm -v; which npm
-  - JOBS=max npm install
+script:
   - npm test
 
-notifications:
-  email:
-    - [email protected]
-    - [email protected]