v0.33.7

Fixes

• fix unassigned variable (#1665, #1664)
• Fix for $path used by zsh (#1669)
• set -u: ensure NVM_USE_OUTPUT is always set (#1671)
• install.sh: Fix a bug that block that installation of node in install.sh (#1676)
• nvm install-latest-npm: fix node 4-4.6

Documentation

• Make nvm cache clear message less ambiguous (#1644)
• Added missing piece (#1658)