Random seed configuration

[mrylmz]

It would be really nice to have a feature to setup Fakery with a seed to guarantee the generation of same data on every reseed with same value.

In case of data generation for Unit-Tests or UI-Tests this would be a really helpful feature to avoid the usage of static string literals inside the tests.

Are there any plans to add new features?

[vadymmarkov]

Sounds like a great feature to have. Feel free to make a pull request if you're up for it.

[grigorye]

Controlling the seed is probably also relevant in context of property-based testing, like in SwiftCheck.

[julasamer]

It's been a long time, but here's a pull request: #148