add spm support

[afc163]

Another great package manager: http://spmjs.io
Documentation: http://spmjs.io/documentation

http://spmjs.io/package/underscore

[jashkenas]

Thanks, but no thanks...

[michaelficarra]

@afc163: See jashkenas/coffeescript#2395.

[jdalton]

I had a similar concern over the added dot file too. See lodash/543.

[davidchambers]

This really is becoming ridiculous. Three JavaScript package managers are not enough, apparently?

[michaelficarra]

Hey, I'm all for more choice, but your package manager is just plain broken if it requires a package-manager-named key in package.json. All meta-information should be generically specified. See all of the other keys in package.json as an example of this.

[jdalton]

Hey, I'm all for more choice, but your package manager is just plain broken if it requires a package-manager-named key in package.json.

I'd rather have it in the package.json instead of in lots of separate files.
This is why we can't have nice things! No one agrees on anything :P

[michaelficarra]

Me too! All meta-information can be in package.json. But not namespaced for your package manager, that's ridiculous.

[jdalton]

But not namespaced for your package manager, that's ridiculous.

Ya though namespacing avoid collisions. I don't mind it (it's a bit of duplicate info but when implementations can't agree namespacing fits well)