add opt-in-only annonymous analytics about ember-cli

[joefiorini]

I have insight working for basic tracking of each command. I need to implement a little more for tracking different options, and I'm also going to add exception tracking. FYI I've had to use my own fork of insight (https://github.com/joefiorini/insight) until yeoman/insight#19 is resolved.

[joefiorini]

I did some research this weekend on how/what to track wrt to a CLI app. For each run of the Ember command, I'd like to know:

1. What command did the user run?
2. What options did the user pass in?
3. Did that user run into a fatal exception? If so, what type?
4. What OS was the user on?
5. What node version was the user on?
6. How long did it take to run to completion?

These are somewhat answerable by Google Analytics, but not without it being somewhat of a hack. I think ideally we'd have a database somewhere where we could just write the data we want and get get a few roll up reports (most used commands, least used commands, least used options, OS breakdown, Node version breakdown, mean/median run time).

That's obviously quite complicated. On top of that, insight doesn't really have much support for capturing different types. Right now it can really only support the 'appview' type, and even then that's only with my fork.

So for now, I'm going to capture two "appview" events per user. The first one will be just the command that the user ran (eg. "ember build") and the second one will be the JSON string of arguments the user passed in (eg. "{ remain: 'production', output: '/example' }"). This should help us enough, and if we really feel it's important in the future, maybe we can look into answering the above questions.

Sound good @stefanpenner?

[stefanpenner]

@joefiorini this looks great. I agree we can move to something more advanced as time allows.