Refactor so "finding .nvmrc" can be done in a bash function.
Find `.nvmrc` files upwards.
locate .nvmrc without `find`
instead of using find and actually cd'ing into directories
we're now using simple string replacement on the `pwd`
Using portable conditional syntax.
Escaping backticks
Updating "nvm run" tests.
Ensuring paths are in quotes, to preserve spaces.
Merge branch 'nvmrc' - Fixes #404