ticket:3 add basic layouts (portrait and landscape) of the EditUserinfoActivity; add activity itself; add skeleton code to start the activity and process results received
ticket:3 refactor the layouts for edit activity, move the OK/Cancel buttons
ticket:3 pass User entity to EditUserinfo activity; initialize edit fields with the values from User entity
ticket:3 add DatePicker dialog
ticket:3 save validated fields to DB
ticket:3 fix data type for a date field
ticket:3 fix the incomplete layout parameter causing NoSuchMethodException
ticket:3 save user info and update when back to the UserInfoTabFragment
ticket:3 add notification after userinfo has been successfully edited and saved
ticket:3 add 'About' tab; change the UserInfoTabFragment instance restore logic
ticket:3 add tests for EditUserinfoActivity and some tests to verify the User model persistance