Report inputChanged when clearing input.

Improve handling of showDropdown in the face of changing results

Bump version to 2.5.2

Merge branch 'local'

Merge branch 'local'

Merge branch 'local' of https://github.com/leei/angucomplete-alt into…

… local

Merge branch 'local' of https://github.com/leei/angucomplete-alt into…

… local

Add angucomplete-alt:forceLocal message to forcibly update result list

Release v2.4.2

Release v2.4.1