Deprecation Fixes

• Fix initializer deprecation (see #4)
• Fix tests

Fix browser support

v1.1.1

Remove object.assign for better browser support

Proxied methods

v1.1.0

Proxy the methods to toastr to process SafeString objects
when working with i18n libraries like https://github.com/jamesarosen/ember-i18n

Thanks to @coladarci for the Pull Request.

Change default injection

Prevents collision with LF, see ember-animation/liquid-fire#338