stop camera upload service when params deleted

fix haiwen/seadroid#127
code format

use 4 spaces to substitue tabs
Merge pull request #134 from Logan676/code_format

code format
close haiwen/seadroid#133
Merge pull request #133 from Logan676/camera

stop camera upload service when params deleted
upgrade version to 1.2.0
add perference header for legacy preference
use custmoized PreferenceFragment for pre 3.0 compatible

fix haiwen/seadroid#124
optimize Gesture Lock
add backward compatibility support

1. create a new package "com.seafile.seadroid2.gesturelock"
2. add Chinese translations
code cleanup
remove hard code strings

translate Chinese strings
add Gesture Lock layout screen size adaptation
code cleanup

close haiwen/seadroid#124