Option to disable Fastboot

[zeppelin]

Currently if ember-cli-fastboot is present in package.json there is no option to op-out from serving the app in Fastboot mode. This is not desired when a feature or two is not compatible with Fastboot (yet), but the app works fine with the static buildpack, which would be fine for ex. a review app. The problem here is that the app can't be deployed without Fastboot anymore, since the entry from package.json can't be removed once features like the Fastboot service is used across the app.

[edmorley]

This buildpack has been deprecated (c06c1e3), and it's also no longer possible for changes to be made to it, due to the issues mentioned in #61.