Added database access to Repo class.
Moved DAO classes to new package.
Added default professor dataset and sample annotation based test
Extracted professor column names to enum
Added samples for manual database tester
Added lecture handling and added some tests.
Organized imports
Updated lecture reference to lecture id
Added DataSet releated regression information
Replaced sample service and related classes.
Removed old application code
Update README.md
Added missing PersonServiceImpl.
Added repo implementation.
Added manual database tests.
Moved SQL statement column identifiers to enums.
Removed old Repo implementation.
Fixed typos
Added embedded database information
Fixed typo and updated data
Added sample for new table and column builder.
Right now the old table class contains dataset references and some
unnecessary methods. Therefore it's better to rewrite the code for the
generator.
Added builder api support to create tables and columns.
Updates DatabaseModel and DataSetGenerator to support tables created via
the TableBuilder. 
Removed unused sample builder package.
Added .gitignore file.