Aurelia enhance() will crash if a <compose> element exists within a compiled component

**Related to this comment:**
https://github.com/aurelia/framework/issues/600#issuecomment-252479570

**Related gist from above comment:**
https://gist.run/?id=c59eed72e1c255b8f462c1d45e495a7a

**I'm submitting a bug report**

* **Library Version:**
1.8.2

**Please tell us about your environment:**
* **Operating System:**
Windows 10

* **Aurelia CLI OR JSPM OR Webpack AND Version**
Webpack

* **Browser:**
Chrome

* **Language:**
TypeScript

**Current behavior:**
If I use `aurelia.enhance(bindingContext, document.body)` on template that was run through the template compiler and has a element in it, I'll get a crash error.

```
TypeError: Cannot read property 'behaviorInstructions' of undefined
at applyInstructions (webpack:///./node_modules/aurelia-templating/dist/native-modules/aurelia-templating.js?:2438:42)
at ViewFactory.create (webpack:///./node_modules/aurelia-templating/dist/native-modules/aurelia-templating.js?:2706:7)
at TemplatingEngine.enhance (webpack:///./node_modules/aurelia-templating/dist/native-modules/aurelia-templating.js?:5233:24)
at eval (webpack:///./node_modules/aurelia-framework/dist/native-modules/aurelia-framework.js?:489:28)
at Aurelia.enhance (webpack:///./node_modules/aurelia-framework/dist/native-modules/aurelia-framework.js?:487:12)
at eval (webpack:///./src/cypress/component-cypress-tester.ts?:195:44)
From previous event:
at eval (webpack:///./src/cypress/component-tester.ts?:153:48)
From previous event:
at eval (webpack:///./src/cypress/component-tester.ts?:116:70)
at eval (webpack:///./node_modules/aurelia-bootstrapper/dist/native-modules/aurelia-bootstrapper.js?:132:12)
From previous event:
at bootstrap (webpack:///./node_modules/aurelia-bootstrapper/dist/native-modules/aurelia-bootstrapper.js?:131:24)
at eval (webpack:///./src/cypress/component-tester.ts?:115:24)
at Context.eval (webpack:///./src/cypress/component-tester.ts?:114:20)
```

**Expected/desired behavior:**
I wouldn't expect this to crash. Currently my workaround is to run the following:
```ts
// NOTE: Jake: 2018-12-20
// Fix aurelia.enhance() problems that are occuring due to
// a in a component.
// Research: https://github.com/aurelia/framework/issues/600#issuecomment-252479570
// Gist: https://gist.run/?id=c59eed72e1c255b8f462c1d45e495a7a
document.body.querySelectorAll('.au-target').forEach((el) => {
el.classList.remove('au-target');
el.removeAttribute('au-target-id');
});

return aurelia.enhance(this.bindingContext, document.body).then(() => {
```

Start with the linked gist and trace aurelia.enhance through TemplatingEngine.enhance, ViewFactory.create, and applyInstructions in aurelia-templating. Reproduce the compiled template containing a element and verify that enhance no longer crashes while processing it.

Written by the indexing model from the issue text.