[Tests] Improve npm dependencies installaion in travis ci

.travis.yml

@@ -22,16 +22,14 @@ before_install:
   - curl --version
   - wget --version
   - if [ -n "${SHELLCHECK-}" ]; then cabal update && cabal install transformers-0.4.3.0 ShellCheck && shellcheck --version ; fi
-  - if [ -n "${DOCTOCCHECK-}" ]; then nvm install node && npm install -g doctoc && type doctoc ; fi
+  - nvm install node && npm install && npm ls urchin doctoc
 install:
-  - (travis_retry mkdir /tmp/urchin && cd /tmp/urchin && curl -s "$(curl -s https://registry.npmjs.com/urchin | grep -Eo '"tarball":\s*"[^"]+"' | tail -n 1 | awk -F\" '{ print $4 }')" -O && tar -x -f urchin*)
-  - chmod +x /tmp/urchin/package/urchin
   - '[ -z "$WITHOUT_CURL" ] || sudo apt-get remove curl -y'
 script:
   - if [ -n "${DOCTOCCHECK-}" ]; then cp README.markdown README.markdown.orig && npm run doctoc && diff -q README.markdown README.markdown.orig ; fi
   - if [ -n "${SHELLCHECK-}" ]; then shellcheck -s bash nvm.sh && shellcheck -s sh nvm.sh && shellcheck -s dash nvm.sh && shellcheck -s ksh nvm.sh ; fi
   - if [ -n "${SHELLCHECK-}" ]; then shellcheck -s bash install.sh bash_completion nvm-exec ; fi
-  - if [ -n "${SHELL-}" ] && [ -n "${TEST_SUITE}" ]; then make TEST_SUITE=$TEST_SUITE URCHIN=/tmp/urchin/package/urchin test-$SHELL ; fi
+  - if [ -n "${SHELL-}" ] && [ -n "${TEST_SUITE}" ]; then make TEST_SUITE=$TEST_SUITE URCHIN="${TRAVIS_BUILD_DIR}/$(npm bin)/urchin/urchin" test-$SHELL ; fi
 env:
   global:
     - CXX=g++-4.8