Suggestion: Remove the "set env as io" feature

[shanoaice]

Suggestion: Remove the "set env as io" feature

(iojs):

  n io latest                    Install or activate the latest iojs release
  n io -a x86 latest             As above but force 32 bit architecture
  n io <version>                 Install iojs <version>
  n io use <version> [args ...]  Execute iojs <version> with [args ...]
  n io bin <version>             Output bin path for <version>
  n io rm <version ...>          Remove the given version(s)
  n io --latest                  Output the latest iojs version available
  n io ls                        Output the versions of iojs available

Here is the usage of iojs, but I had mentioned that iojs had been merged into node.js at v4(Probably).
So I think this feature is useless, I suggest you to remove this feature.

Thanks!

[shadowspawn]

Thanks. There is an open Pull Request #516 to remove the old io project support.