Make symlink to /usr/local/bin/node optional on OSX installer

[mmarcon]

In order to be able to run node and io.js in parallel and easily choose what to run, it would be nice if the OSX installer did not automatically create a symlink in /usr/local/bin/node.

[fhemberger]

+1, if you've installed node via homebrew, you can symlink the node binary again, but if you've used the official node.js installer, your binary is overwritten by the symlink.

Symlinking should be an optional checkbox during the installation process.

[fampinheiro]

The symlink cannot be optional if you want to use npm #249

[Pana]

It seems npm should add support for iojs

[h2non]

Agree! I think it's a bit intrusive create an implicit symlink without asking

[bnoordhuis]

I don't know if homebrew applies any special sauce but just skipping the symlink normally isn't enough to make joyent/node and io.js coexist, all the stuff that is installed to $prefix/share, $prefix/include/node, etc. conflicts. You have to install them to separate directories.

[nacholibre]

This will answer your question #631

People think (and I was too) that iojs is different from node, but its just newer version of node, so if you want to install new version of node without breaking your current one, just use nvm.

[benpptung]

@nacholibre Thank you very much :) I'd suggest to put this information on FAQ, because the first thing coming to my mind is not how to install io.js, but how to switch between io.js and node.js. Don't know nvm can do that, I am always using n and I see @caitp in #631 mention "...NVM is pretty terrible, it's a pain in the ass..." lol . Thank you again :)

[jdduncan]

"The symlink cannot be optional if you want to use npm".
Fair enough: I don't want to use npm. I'm doing development, not production. I want to test my code (including not just javascript, but also compiled native code) with io.js.

[Fishrock123]

@jdduncan for development it is probably more useful overall to just use nvm -- that way you can also update easily, and switch between any node / io.js version.