[BUG] This fixes issue #11. This occurs when no options are specified

Fixes issue #11 (when running on new ember-cli 0.0.42). When no options are defined in the ember-cli project's brocfile.js, then the options object will be undefined. So ensure that the options object exists before looking for its components or import properties.

Made these small changes and verified that Hello World "{{bs-alert message="A self destroyable hello world message!" type="info" dismissAfter=2 fade=true}}" now works in my ember-cli project after this change. 
This is a good catch and definitely should be fixed. The way I would like to handle it is to actually set options to an empty object if `app.options['ember-cli-bootstrap']` is undefined:
```javascript
var options = app.options['ember-cli-bootstrap'] || {};
```