[Tests] add node 8 (allowed failures for now); remove node 5; improve…

… npm installation logic.

.travis.yml

@@ -1,13 +1,15 @@
 language: node_js
 node_js:
+  - "8"
   - "6"
-  - "5"
   - "4"
   - "0.12"
   - "0.10"
 before_install:
-  - 'if [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then case "$(npm --version)" in 1.*) npm install -g [email protected] ;; 2.*) npm install -g npm@2 ;; esac ; fi'
-  - 'if [ "${TRAVIS_NODE_VERSION}" = "0.12" ] || [ "${TRAVIS_NODE_VERSION}" = "0.10" ]; then npm install -g [email protected] ; elif [ "${TRAVIS_NODE_VERSION}" != "0.6" ] && [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then npm install -g npm; fi'
+  - 'if [ "${TRAVIS_NODE_VERSION}" = "0.6" ]; then npm install -g [email protected] ; elif [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then case "$(npm --version)" in 1.*) npm install -g [email protected] ;; 2.*) npm install -g npm@2 ;; esac ; fi'
+  - 'if [ "${TRAVIS_NODE_VERSION%${TRAVIS_NODE_VERSION#[0-9]}}" = "0" ] || [ "${TRAVIS_NODE_VERSION:0:4}" = "iojs" ]; then npm install -g [email protected] ; elif [ "${TRAVIS_NODE_VERSION}" != "0.6" ] && [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then npm install -g npm; fi'
+install:
+  - 'if [ "${TRAVIS_NODE_VERSION}" = "0.6" ]; then nvm install 0.8 && npm install -g [email protected] && npm install -g [email protected] && npm install -g npm@2 && npm install && nvm use "${TRAVIS_NODE_VERSION}"; else npm install; fi;'
 before_script:
   - "sh install-relevant-react.sh"
   - if [ -n "${KARMA-}" ]; then export CHROME_BIN=chromium-browser; export DISPLAY=:99.0; sh -e /etc/init.d/xvfb start; fi