[WIP] Expand on handlers/middleware concepts

[joshuajabbour]

Adapter implementations:

• https://github.com/ferryjs/ferry-express/pull/3
• https://github.com/ferryjs/ferry-router-basic/pull/2
• https://github.com/ferryjs/ferry-swagger/pull/3
• https://github.com/ferryjs/ferry-waterline/pull/2

Examples:

• https://github.com/ferryjs/ferry-examples/pull/2

[joshuajabbour]

Cleaning up my Github...