Cleanup API

[jackmatt2]

Cleanup the API

• consistent and intuitive way to modify the selection/suggestion results as Setting Suggestion Value from Object property #14
• improve DELETE behaviour to be more user friendly Backspace is deleting everything #29
• Use components instead of templates Allow different components to be used in templates #12
• Rename to ember-typeahead Combine forces with ember-cli-twitter-typeahead somehow? #7
• Add more tests and specifically cover all scenarios.
• Path to Glimmer Components (angle bracket components)
• Reduce rather than increase component parameters.

Will consider breaking the existing API if the gain calls for it.

This issue is open for discussion about a better user experience with this addon. Feel free to express the frustrating points of the api.