Move GenerationOptions

[vanillajonathan]

Move /Configuration/GenerationOptions.cs to /GenerationOptions.cs. Moving it away from a separate directory into the source root eases discoverability of the class.

Change the namespace from "shortid.Configuration" to "shortid".

[detach8]

I second this, and would also recommend changing class to ShortIdOptions or something more unique to the project.

[bolorundurowb]

I guess the community has spoken, I'll mark the GenerationOptions class as obsolete and update the naming in the next major release. Thanks for the feedback @vanillajonathan and @detach8