nvm ls v1.0.3
iojs-v1.0.3
Also fix `nvm uninstall v1.0.3` so it won't uninstall it if it's the current version. node versions will still take priority if there's ever a version overlap.
nvm use node
nvm use iojs
nvm ls node
nvm ls iojs
Also add `nvm_version node` and `nvm_version iojs` support.