make offline photo private to this app
add preference setting UI
preference.xml change, remove unused things
add setting item for download when charging
offline settings taking effect
hide action bar for my own photos
add 2 buttons in main menu back view, download and delete photos
download/remove offline photos
add setting for max photo size
bug fix for max photo size
bug fix for the scheduled offline download service trigger
remove  test code of the timer service
minor change on PicornerApplication
enhance flickr tag search
bug fix: tag search enhancement
adjust the 2nd menu items