(TK-68) Add single server static content support

Add static content configuration support to single server
configurations.
(TK-68) Add multi-server static content support

Add static content support to multi server configurations.
(TK-68) Add docs for static content configuration

Add docs explaining the new method of specifying static content
to be added to the server during initialization.
(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.
Merge pull request #72 from fpringvaldsen/TK-68-specify-static-content

(TK-68) Allow the user to specify static content to be added during initialization
Update CHANGELOG for 0.7.3
lein-release plugin: preparing 0.7.3 release
lein-release plugin: bumped version from 0.7.3 to 0.7.4-SNAPSHOT for next development cycle
(TK-68) Update static content example

Update the static content example in the config docs to reflect
a more conventional use case.
Merge pull request #74 from fpringvaldsen/TK-68-PR-comments

(TK-68) Update static content example
(TK-73) Add option to serve symlinks

Add an option to serve symbolic links when serving static
content. This option defaults to false and can be specified
with `add-context-handler` or when specifying static content
in a trapperkeeper config file.
(TK-73) Change symlink option to follow-links

Change symlink option from serve-links to follow-links.
Merge pull request #75 from fpringvaldsen/TK-73-symlinks

(TK-73) Add option to serve symlinks
Update changelog for 0.7.4 release
lein-release plugin: preparing 0.7.4 release
lein-release plugin: bumped version from 0.7.4 to 0.7.5-SNAPSHOT for next development cycle
(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