Merge pull request #102 from Logan676/lg2

add camera upload
remove tabs from java code
change actionbar title to show visiting directory dynamically.

the title shows the current repository or directory user in, 
also clean up the unused string value.
add "no upload tasks" info to UploadTasksActivity

give user a feedback if there are no uploading tasks added to
UploadTasksActivity
remove upload button text and refresh button text in action bar
upload photos to "Camera Uploads" directory only

use cache to ensure no duplicate "Camera Uploads" directory was created
remotely.
change text style in Settings.
fix Camera Uploads issues

change to use remote dirent to ensure no duplicate "Camera Uploads"
directory was created remotely.
clean source code
add remote library delete detection