Does not work with a custom output-path

[austinezell]

Ember CLI lets you change the output directory of your built assets via .ember-cli file's output-path property. When this property is set, the ember-cli-bundle-analyzer is not able to find the published assets. I ended up disabling this config to run the analyzer, but it was kinda hard to debug because the error just stated that there were no files to analyze, even though I could see them loaded into the main app. Might be nice to read that property and respond to it, or at the very least document that it is not supported.

This next thing is unrelated to the first, but I didn't want to open a second issue. I had to separate out he autoImport property from the rest of the createEmberCLIConfig() and assign them individually, otherwise it clobbered my custom autoImport.webpack config and the app would not build. Might be nice to include that edge-ish case in the documentation as well.

All in all, great app though! Thanks for building this.