[TASK] cleanup notification class

- adopt Error use
- make NotificationParser a singleton
[TASK] cleanup settings

- remove ensureConnected
- remove unused
- adopt new error and response handling
- re-add newline whitespace
[TASK] clean up transaction class

- remove ensureConnected
- adopt new Error use for communication failure cases
- add newline whitespace for readability
[FEATURE] add created response
[TASK] cleanup trustlines 

- adopt error and response handling
- remove ensureConnected logic
- add newline whitespace for readability
[TASK] remove now unused serverlib

connected check now happens in the router
[TASK] remove connected and uuid from info class

- connected is reduced to always return true since it comes after the rippled connected check
- uuid returns a uuid is not dependent on rippled connection
[TASK] move server connected and uuid logic back to info
[TASK] get correct port property from config
Merge pull request #138 from geertweening/develop

Adopt error and response handling in remaining classes