ticket:7. Sort friends is not working properly when moving from tab to tab
ticket7. Fix sort bugs. Add test
ticket7. Fix display avatar. Rewrite test. Add button for refresh ListView after sort.
Merge remote-tracking branch '42cups/ticket7'

Conflicts:
	42cupsTest/AndroidManifest.xml
	42cupsTest/src/com/example/cups/test/TabActivityTest.java
	res/layout/activity_friends_list.xml
	res/layout/activity_main_tab.xml
	res/layout/friendslistadapter.xml
	res/menu/about_tab.xml
	res/menu/edit_dbtab.xml
	res/menu/friends_list.xml
	res/menu/main.xml
	res/menu/main_tab.xml
	res/menu/my_date_picker_dialog.xml
	res/values/strings.xml
	src/com/example/cups/EditDBTab.java
	src/com/example/cups/Friends.java
	src/com/example/cups/FriendsList.java
	src/com/example/cups/FriendsListAdapter.java
	src/com/example/cups/MainActivity.java
	src/com/example/cups/MainTab.java
	src/com/example/cups/MyInfoDB.java
	src/com/example/cups/MySatellite.java