creationix/nvm — pull request #450 by mzgol (2014-07-02 12:59:08+00:00)
Title: Use bash, not sh for install scritps

Install scripts don't work in pure sh; they may work on some systems where
the /bin/sh binary actually implements more than the pure Bourne Shell but
fail on other ones (e.g. Ubuntu).

Just using bash works.