Merge branch 'release/0.2'
Merge branch 'release/0.3'
fix a bug about upstart
get out of debug info
print big_wallpaper log in file
change default log path from /var/log/big_wallpaper.log to /tmp/big_wallpaper.log
Replace Storm ORM with Peewee.
Fixed the potential issue of iterator.
Merged feature/peewee
Reapplied the fix of auto_start_item.
change the WallPaperLog class to Singleton
pull https://github.com/yaleh/BigWallpaper.git on branch develop and merge master