(TK-69) Add new webrouting example using compojure

Add a new webrouting example that adds a ring handler using
compojure that changes depending on the path it is given.
Update webrouting example and webrouting docs to use `this`
instead of `get-service` when using the webrouting service.
(TK-75) Make Gzip encoding configurable for the Jetty webserver

This commit adds an option to the webserver configuration,
`gzip-enable`, which can be used to control whether or not the webserver
would attempt to compress the response body using Gzip encoding.
Merge pull request #73 from fpringvaldsen/TK-69-new-example

(TK-69) Add new webrouting example using compojure
Merge pull request #77 from camlow325/feature/master/TK-75-make-gzip-encoding-configurable

(TK-75) Make Gzip encoding configurable for the Jetty webserver
Update CHANGELOG for 0.7.5 release
lein-release plugin: preparing 0.7.5 release
lein-release plugin: bumped version from 0.7.5 to 0.7.6-SNAPSHOT for next development cycle