allow the addon to be enabled/disabled through configuration

[GavinJoyce]

This allows the addon to be enabled / disabled through configuration in ember-cli-build.js:

'ember-cli-deprecation-workflow': {
  enabled: true,
},

Let's use this in our app for a little while first before considering if we should try to upstream it to https://github.com/mixonic/ember-cli-deprecation-workflow

[himynameisjonas]

Hi,
Have you tried it out for a little while now? 😄

This patch would help us at Teamtailor since our main app doesn't include any tests in the development builds so the app.tests check doesn't work for us.

[GavinJoyce]

👋 We still use this option, yes. It would be great to add this to mixonic/ember-cli-deprecation-workflow. Perhaps you'd be interested in submitting a PR?

[himynameisjonas]

👋 We still use this option, yes. It would be great to add this to mixonic/ember-cli-deprecation-workflow. Perhaps you'd be interested in submitting a PR?

I've opened a PR based on your work now 👍
ember-cli#88

[GavinJoyce]

Nice one, thanks!