[Tests] up to v5.6, v4.3

.travis.yml

@@ -1,7 +1,13 @@
 language: node_js
 node_js:
+  - "5.6"
+  - "5.5"
+  - "5.4"
+  - "5.3"
+  - "5.2"
   - "5.1"
   - "5.0"
+  - "4.3"
   - "4.2"
   - "4.1"
   - "4.0"
@@ -35,12 +41,18 @@ before_install:
   - 'if [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then case "$(npm --version)" in 1.*) npm install -g npm@1.4.28 ;; 2.*) npm install -g npm@2 ;; esac ; fi'
   - 'if [ "${TRAVIS_NODE_VERSION}" != "0.6" ] && [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then npm install -g npm; fi'
 script:
-  - 'if [ "${TRAVIS_NODE_VERSION}" != "4.2" ]; then npm run tests-only ; else npm test ; fi'
+  - 'if [ "${TRAVIS_NODE_VERSION}" != "4.3" ]; then npm run tests-only ; else npm test ; fi'
 sudo: false
 matrix:
   fast_finish: true
   allow_failures:
+    - node_js: "5.5"
+    - node_js: "5.4"
+    - node_js: "5.3"
+    - node_js: "5.2"
+    - node_js: "5.1"
     - node_js: "5.0"
+    - node_js: "4.2"
     - node_js: "4.1"
     - node_js: "4.0"
     - node_js: "iojs-v3.2"
@@ -61,6 +73,5 @@ matrix:
     - node_js: "iojs-v1.0"
     - node_js: "0.11"
     - node_js: "0.9"
-    - node_js: "0.8"
     - node_js: "0.6"
     - node_js: "0.4"