Add tests.
Update readme to remove example.
Fix sequence and change gem from unit/test to unit-test for startup and shutdown methods.
Add test number 3 for check alter schema table.
Update readme, separate command for change schema and sync data.
Add test to check to not exist primary key on table.
Test refactoring.
Test refactoring.
Uncomment destructor class on Schema.
Change scope of variables.
Merge pull request #1 from nicola51980/test

Test