apply orange theme to dialog divider

improve Untrusted Connections Dialog UI
fix #181
add progressbar to Libraries tab

show PTR syle progressbar when pull to refresh
show classic progressbar on Resume
show classic progressbar when loading directories
show classic progressbar when refreshing via overflow menu
remove pull-to-refresh of Activities tab
force to update directories
force update Repos View
change expire time to 10 mins
close #179
improve code style
imporve method name
redesign refresh algorithm
improve code style
fix refresh algorithm error
improve refresh algorithm
fixed build errors
remove TabFragment
use tabs_main layout
rebase on haiwen master

Conflicts:
	res/layout/seadroid_main.xml
	src/com/seafile/seadroid2/ui/activity/BrowserActivity.java