Use Ember.TextField instead of generic Ember.Component
Use Ember.TextField instead of generic Ember.Component

Datepicker is an input field, so it much better to use Ember.TextField.
It automatically gives attributes like `name`, `size`, `placeholder` and etc.

This also closes #2

lazybensch/ember-cli-bootstrap-datepicker,aldhsu/ember-cli-bootstrap-datepicker,aldhsu/ember-cli-bootstrap-datepicker,topaxi/ember-bootstrap-datepicker,jesenko/ember-cli-bootstrap-datepicker,maladon/ember-cli-bootstrap-datepicker,jelhan/ember-cli-bootstrap-datepicker,aravindranath/ember-cli-datepicker,aravindranath/ember-cli-datepicker,aldhsu/ember-cli-bootstrap-datepicker,Hanastaroth/ember-cli-bootstrap-datepicker,NichenLg/ember-cli-bootstrap-datepicker,soulim/ember-cli-bootstrap-datepicker,soulim/ember-cli-bootstrap-datepicker,lazybensch/ember-cli-bootstrap-datepicker,jesenko/ember-cli-bootstrap-datepicker,maladon/ember-cli-bootstrap-datepicker,aravindranath/ember-cli-datepicker,topaxi/ember-bootstrap-datepicker,Hanastaroth/ember-cli-bootstrap-datepicker,Hanastaroth/ember-cli-bootstrap-datepicker,NichenLg/ember-cli-bootstrap-datepicker,lazybensch/ember-cli-bootstrap-datepicker,jelhan/ember-cli-bootstrap-datepicker,maladon/ember-cli-bootstrap-datepicker,jelhan/ember-cli-bootstrap-datepicker,NichenLg/ember-cli-bootstrap-datepicker,soulim/ember-cli-bootstrap-datepicker,jesenko/ember-cli-bootstrap-datepicker