(TK-51) Move webrouting server info to config

Move the server info for each endpoint in the webrouting service
into the trapperkeeper configuration, rather than having the
user hardcode it when adding a handler with the webrouting
service.
(TK-51) Update docs and example with new config

Update docs and example for the webrouting service to reflect
the new configuration changes to the webrouting service.
Merge pull request #54 from fpringvaldsen/TK-51-server-endpoint-in-config

(TK-51) Move webrouting server info to config