#1707
add vector icons
show aqi value on aqi widget
remove protected setWidgetStyle
modify update time to download time
display "loading"msg at update is started.

try-catch for ArrayIndexOutOfBoundsException, NullPointerException

rename apppreferences to widget_preferences

set requestCode for Classification

check null of geo info
update format of geoinfo.tostring

move alarmManager to WidgetProvider from Settings

#1486 #1696
move alarmManager to WidgetProvider from Settings
service on foreground

fix wrong save current geo info

#1658
use START_REDELIVER_INTENT for service
use PASSIVE_PROVIDER for getLastKnownLocation
use requestSingleUpdate and Criteria

#1486
use stopSelf(startId)
use alarmManager.setRepeating

#1658 #1486
remove stopSelf()
change geoinfo to savedGeoInfo when new location is the same as saved geo info

#1658
location listener 에서 새로 생성하는 것으로 변경.

save current geo info

#1658
마지막 현재위치에 대한 geo info를 저장함.
url은 get weather info 시에 생성함.

check network when widget update

#1604
check network when widget update
if disconnected it will retry after 1 min.

refactoring to event based