need to exclude ourselves when looking up blueprints

[kbullaughey]

This fixes #114.

As I understand things, the coffeescript blueprints relied on finding the non-coffeescript blueprint using lookupBlueprint. Now that the blueprints have moved into the ember-cli-legacy-blueprints addon, this lookup wasn't working. I found I needed to exclude the coffeescript blueprints when the legacy blueprints were searched for. I accomplished this using a new method, ancestralBlueprint that I stashed in lib/utilities/ancestral-blueprint.

Not sure this is the optimal strategy, but it seems to work, and I was able to generate all the blueprints that rely on lookupBlueprint.

[mazondo]

Can we get this merged in, or is there a better solution coming?

[kimroen]

I'm very sorry that I've left this and other projects hanging. I'll merge this in now, then try out some things manually, and release a new version with this and some other fixes (hopefully soon, but I can't promise anything).

I'll need to figure out if this breaks on older versions of ember-cli or not, because if it does then I need to bump the major version number, and I kind of want to implement tests before I do so.

Thank you very much for looking in to this.

[deverin]

This fixes #116

[kimroen]

This has now been released as v1.15.0, with some tweaks (#118) to make it work on older versions of Ember CLI as well.

Thank you again for your help, and for being patient with me. 🎈