Repository: nvm
Issue: Option to disable curl-like download progress
Labels: installing node,feature requests,pull request wanted

https://github.com/creationix/nvm/blob/1c3f8da6c38bdfecf3dbf01c6753a6fd27032b9d/nvm.sh#L45-L51

That section of code looks pretty messy when nvm is used in a CI system like Jenkins.  Here's a small snippet of what that looks like to Jenkins' streaming console log.

```
...
###                                                                        5.3%
###                                                                        5.3%
###                                                                        5.3%
###                                                                        5.4%
###                                                                        5.4%
###                                                                        5.4%
###                                                                        5.4%
###                                                                        5.5%
###                                                                        5.5%
###                                                                        5.5%
####                                                                       5.6%
####                                                                       5.7%
####                                                                       5.8%
####                                                                       5.9%
####                                                                       6.0%
####                                                                       6.1%
####                                                                       6.2%
####                                                                       6.3%
####                                                                       6.4%
####                                                                       6.4%
####                                                                       6.4%
####                                                                       6.5%
####                                                                       6.5%
####                                                                       6.5%
####                                                                       6.6%
####                                                                       6.6%
####                                                                       6.7%
####                                                                       6.7%
####                                                                       6.7%
####                                                                       6.7%
####                                                                       6.8%
####                                                                       6.8%
####                                                                       6.8%
####                                                                       6.9%
#####                                                                      7.0%
#####                                                                      7.0%
#####                                                                      7.0%
#####                                                                      7.1%
#####                                                                      7.2%
#####                                                                      7.2%
#####                                                                      7.3%
#####                                                                      7.3%
#####                                                                      7.4%
...
```

It would be great if there was an option to disable the progress bar.  While it's true I can discard output (e.g. `nvm install v4.2.3 &> /dev/null`) I fear discarding potentially valuable troubleshooting output from stderr.