Release version 1.28.0

Release version 1.28.0

Changes:
 - Fix StepKillApps
 - Use lambda expressions for simple callback function
 - Implement package dependency feature
 - Add string into include list
 - Remove using assert() in ExternalStorage
 - Add GetRequestTypeString() to print request type
 - Change visibility of steps to protected
 - Print request type at StepConfigure
 - Remove routine for checking name duplication on installer plugin
 - Fix bug of debug mode installation of hybrid package
 - Implement execution of removed plugin feature
 - Parse new elements for component-based application

Change-Id: Ic3e0ab612712535f43a5efd1f51da35b3a8850d5
Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>