Confusing ember generate error messages

[tomdale]

Invoking ember generate incorrectly causes either a confusing error message to be displayed, or a stack trace to get dumped:

➜  pdxbus  ember generate           
version: 0.0.23
generating from:
  - node_modules/loom-generators-ember-appkit/loom
-> You must specify a resource name, ie 'generate  user'

It looks like there is a bug in the generated example command because there are two spaces between generate and user.

If we do as it suggests (ember generate user):

version: 0.0.23
generating from:
  - node_modules/loom-generators-ember-appkit/loom
-> You must specify a resource name, ie 'generate user user'

I'm not sure what this is saying. Anyway, I wanted to create a new model:

version: 0.0.23
generating from:
  - node_modules/loom-generators-ember-appkit/loom

/Users/tomdale/Code/pdxbus/node_modules/loom-generators-ember-appkit/loom/generators/default.js:20
  var params = env.params;
                  ^
TypeError: Cannot read property 'params' of undefined
    at Object.generator.present (/Users/tomdale/Code/pdxbus/node_modules/loom-generators-ember-appkit/loom/generators/default.js:20:19)
    at Object.generator.present (/Users/tomdale/Code/pdxbus/node_modules/loom-generators-ember-appkit/loom/generators/model.js:8:23)
    at afterBefore (/usr/local/lib/node_modules/ember-cli/node_modules/loom/lib/runner.js:35:17)
    at Object.generator.before (/Users/tomdale/Code/pdxbus/node_modules/loom-generators-ember-appkit/loom/generators/default.js:15:5)
    at runGenerator (/usr/local/lib/node_modules/ember-cli/node_modules/loom/lib/runner.js:32:15)
    at /usr/local/lib/node_modules/ember-cli/node_modules/loom/lib/runner.js:26:7
    at /usr/local/lib/node_modules/ember-cli/node_modules/loom/lib/get_generator.js:12:14
    at Object.cb [as oncomplete] (fs.js:168:19)

I believe this stack trace is because there is no model generator (per https://github.com/cavneb/loom-generators-ember-appkit).

Two things:

1. It looks like we need a model not found error.
2. Since we ship with Ember Data by default, we should probably also have a model generator included as well.

[stefanpenner]

closing in favor of: #351