Deprecate usage of {{render helper with a model param.

[rwjblue]

This is always better written today as a component invocation, we should deprecate this.

Bad:

{{render 'foo-bar' someModelThingy}}

Good:

{{foo-bar model=someModelThingy}}

---

• AST transform to deprecate while compiling templates (to provide line number information)
• Add deprecation guide entry in emberjs/website

[pittst3r]

I'll take a stab at this.

[rwjblue]

Awesome, thanks!