travis.yml :: refactor to use matrix build and nodejs v6

Author: mimetnet

.travis.yml

@@ -6,20 +6,31 @@ notifications:
   email: false
 
 before_install:
-  - '[ "${TRAVIS_NODE_VERSION}" != "0.8" ] || npm install -g npm@1.4.28'
-  - npm install -g npm@latest
+  - npm install -g npm@2
+  - npm install -g npm
   - '[ "${TRAVIS_NODE_VERSION}" == "0.8" -o "${TRAVIS_NODE_VERSION}" == "0.10" ] || npm install -g covert'
 
-script:
-  - '[ "${TRAVIS_NODE_VERSION}" != "0.8" -a "${TRAVIS_NODE_VERSION}" != "0.10" ] || npm test'
-  - '[ "${TRAVIS_NODE_VERSION}" == "0.8" -o "${TRAVIS_NODE_VERSION}" == "0.10" ] || npm run coverage'
+matrix:
+  fast_finish: true
+  include:
+    - node_js: '0.8'
+      env: TASK=test
+    - node_js: '0.10'
+      env: TASK=test
+    - node_js: '0.12'
+      env: TASK=coverage
+    - node_js: '1'
+      env: TASK=coverage
+    - node_js: '2'
+      env: TASK=coverage
+    - node_js: '3'
+      env: TASK=coverage
+    - node_js: '4'
+      env: TASK=coverage
+    - node_js: '5'
+      env: TASK=coverage
+    - node_js: '6'
+      env: TASK=coverage
+
+script: "npm run $TASK"
 
-node_js:
-  - '0.8'
-  - '0.10'
-  - '0.12'
-  - '4'
-  - '5'
-  - 'iojs-v1.0.0'
-  - 'iojs-v2.0.0'
-  - 'iojs-v3.0.0'