AC-1 Add more rulers

Use the nested callbacks pattern to add more rulers.

Set 'Cersei' as the current ruler for initial state.

After 5 seconds the ruler should be 'Danny'.

3 Seconds after that the new ruler should be 'Jon Snow'

2 seconds after that should be 'Euron Greyjoy'

2 extras seconds and the ruler should be 'Jaimie Lannister'.

Finally a second after the kingslayer, the ruler should be 'Nightking'.

Golden Rule: Use only setTimeout function for this purpose.