Clean up code. | Edit multiple routes.

[rdok]

1. Add validation request | EditRouteRequest
2. Extract only data we work with. | EditRouterExtractor
3. Use single responsibility principle for editing all routes. |
4. Add flash messages. Why session messages are preferred:
   1. Store messages in session data until they are retrieved from any page.
   2. Pass message to flash array from any where in the project.

See 7ddef43

[PadawanTony]

@rdok I added flash messages. Feel free to clean up the code.

[rdok]

@PadawanTony Yep. I'll add flash messages based on sessions rather than just static ones.

[PadawanTony]

ok!

When you do it, please explain why it is better.