Import from package 'features'.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Updating package 'features'.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Adding reference of public databases and other.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Changing name of Reynold's thesis reference.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>