remove global flag.

[stefanpenner]

Addons can check via:

this.project.addons.find(addon => addon.name === 'ember-cli-fastboot'):
this.project.findAddonByName('ember-cli-fastboot');

[kratiahuja]

This was introduced for a corner usecase for ember-cli-head to be backward compatible: https://github.com/ronco/ember-cli-head/blob/master/index.js#L13

[kratiahuja]

Though now that I think about it, this flag would not be needed if treeForApp in ember-cli-head is refactored.

[stefanpenner]

ember-fastboot/ember-cli-head#30

[stefanpenner]

@kratiahuja ah, that would be even better. But if we need to check explicit things, (like capability) a version check may be more appropriate then a global flag.

But if it can be refactored away entirely, we should take that approach.

[kratiahuja]

Yeah I don't think we need the if..else really...