added nvm unload method to remove nvm from shell
Added test for nvm unload
Merge pull request #405 from reqshark/master

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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
Nicer failure message when trying to install an invalid version. Fixes #285.
Editing README to note improved .nvmrc behavior.
v0.6.0
Adding a test for `nvm install invalid` behavior, and correcting the message.

From https://github.com/creationix/nvm/commit/f00d688c87873a9e3cffc1dbf54f63e0edd6e69b#commitcomment-6205164
v0.6.1
use sed for *PATH stripping
remove parentheses
use nvm_strip_path utility method for path stripping
add quotes