Refactored constants.
Implemented NewsParser.
Finished onCreateDatabase.
Implemented creation of ContentValues in data classes
Implemented loader from db. Minor changes in dbOpenHelper.
Some fixes in interface. IMplementation of parsing xml.
Fixed icon.
Implemented parsing of aml after downloading new xml.
Fixed bug with parsing.
Written code for adding new data to database.
Fixed bugs in saving new data to database.
Implemented singleton for news and timetable.
Fixed bugs in saving data into database.