Returning exit code 3 when no version is found.
Consistently returning exit code 1 when version is not installed yet.
Return the exit code of `nvm use` when `nvm install`-ing.
Removing reference to NVM_PROFILE in README. Fixes #442
Silently support `nvm i x.x.x`. Fixes #443.
Making sure there's test coverage for `nvm i`
Separating variable declaration from first assignment, which should fix some ksh problems.
Use printf instead of `echo -e`

Fixes #446
v0.9.0
Make sure `nvm ls foo` returns a nonzero exit code when a version is not found.

Fixes #440.
Make sure these vars are local, where supported
Don't bother trying to return the exit code of `nvm alias` or `nvm_print_versions`
Merge pull request #444 from creationix/fix_nvm_ls

Make sure `nvm ls foo` returns a nonzero exit code when a version is not found
v0.10.0
Following http://www.shellcheck.net advice
wip