Problem: nvm needs to be installed for all

Solution: install nvm for everyone

Author: rgbkrk

.travis.yml

@@ -29,7 +29,8 @@ env:
  - ZMQ="4.1.3" SODIUM="1.0.5"
 
 before_install:
- - if [ $TRAVIS_OS_NAME == "osx" ]; then brew update; brew install nvm; mkdir ~/.nvm; . $(brew --prefix nvm)/nvm.sh; fi
+ - git clone https://github.com/creationix/nvm.git ./.nvm
+ - source ./.nvm/nvm.sh
  - nvm install $NODE_VERSION
  - nvm use $NODE_VERSION
  - node --version