In `install.sh`, rename `has` to `nvm_has` for consistency with `nvm.sh`.
Naming `install.sh` functions more explicitly as being for `nvm`.
Shellcheck recommendations.
add newline to printf
Merge pull request #457 from koenpunt/patch-1

Add newline to printf command
Using an `nvm_curl` function instead of `curl`/`wget` directly.
Use `nvm_curl` instead of `curl` directly, which has a `wget` fallback.
Add some more curl → wget argument munging
Make `nvm_curl` do a runtime check if `curl` is available.
Make sure both wget and curl work.
Removing an extra "echo"
fix nvm_curl arguments for stdout
Revert part of the change from e0537ce3dfba5c5bcfc78f5ba29c759de9e397ad, fixes #458
Merge pull request #459 from koenpunt/curl_wget_handling

fix nvm_curl arguments for stdout
Merge pull request #452 from creationix/curl_wget_handling

Better combo curl/wget handling
Followup per https://github.com/creationix/nvm/pull/452#issuecomment-48151847
Finalize fix for #458
Merge pull request #460 from koenpunt/patch-1

Finalize fix for #458
Following http://www.shellcheck.net advice
wip