facebook sdk was added
ticket:2 Added Facebook adk. Created tests.
ticket:2 Database was changed. Added 2 tests.
ticket:2 Added models User.java and Location.java
ticket:2 Tests corrected.
ticket:2 Implemented methods: addUser, addLocation, getUser, getLocation in class DatabaseWorker.java
Added implementation of authentication with Facebook (but not work yet). Changed encoding.
ticket:2 Renamed packages.
ticket:2 Changed tests. Implemented output of user data on screen. Implemented user interface.
ticket:2 implemented loading of user data
ticket:2 Created ProfileActivity. Partially implemented of  connection exceptions handling.
ticket:2 MainActivity changed. Added buttons 'My profile' and 'My friends'.
ticked:2 Fixes of tests.
ticket:2 just a bit changes in tests.
merge t2 to master