Add class name attribute and support for tab key press

Add input-class-name attribute to directive to allow for specifying a class name on the input field.

When clicking the tab key while on an item in the dropdown list, the item will be selected and the page focus will move on to the next item in the form as expected.

Add option for allowing custom user input

Validates the input field on any user input, not just when an item from the list is selected. Documentation

Small bug fix

v1.0.1

Fixed bug when pressing arrow keys when dropdownItems was null

v1.0

Added gitignore and bower files