Updated version number to 1.0.0beta5.
Fixed to update the directory list when a new file was selected.
Recolored the head of the file list to #bbbbbb.

This value (#bbbbbb) came from color of the buttons, but I feel that
this color is more dark than original that of the buttons.
Changed style of the list to fastScrollEnabled.
Updated ChangeLog and Plan for 1.0.0beta5.
Updated the screenshots of the file list.
Merge branch 'master' of ssh://github/SumiTomohiko/AnAudioPlayer