Standardise Date Output

[Michael Johnson]

Items using the anime and manga models aren't using the same output date format. We should add some setDate functions so the output format is consistent whenever we return an instance of the object.

[Michael Johnson]

Looking at the Ruby API, it's doing the same darn inconsistency. For compatibility sake, it might be best to leave it alone. Once parity is reached, this kind of cleanup can be done for a future release.

[Ratan Dhawtal]

I will probably add new functions(I am considering to add profile comments) when atarashii 1.4 got stable released .

We will see it by then I guess.

[Ratan Dhawtal]

All the date outputs are now standardised by the date model.

Note: only anime/manga dates aren't included.