succeeded in creating a table and inserting some columns. The sequence
was named like "s_apk_id" by default by squeryl though it was named like
"apk_id_seq" by others such as evolutions. Since I have no idea what
name is better, I made it correspond with the evolutions' one for now.
the GlobalSettings must be defined in the default package.
move the files about database to the database package.
fix the import lines about database.
renamed "ApkTable" to "Apk" because Db should not insert ApkTable but
Apk.
create ApkDao