Add a clojars version badge to the README.md

This simplifies and automates the display of the latest version. Its a shame
its not text so it can't be cut & paste, but its better then nothing and
maintained by clojars, so no reliance on some startup SaaS service that may
disappear tomorrow.

Signed-off-by: Ken Barber <ken@bob.sh>
Add a callback to the rewriteURI method
(TK-53) Add get-route service function

Add a get-route service function to the Webrouting service which
gets the web-route configured for a service in the configuration
file.
Merge pull request #58 from fpringvaldsen/TK-53-get-route

(TK-53) Add get-route service function
Fixes based on the PR comments
Merge pull request #57 from fhrbek/rewrite_uri_callback

WIP - Add a callback to the rewriteURI method
(TK-45) Add string support to `:scheme:` option

Allow the `:scheme` option for a proxy to take a string
as well as a keyword.
(TK-33) Add proxy redirect test

Add a proxy redirect test to the proxy test file.
(TK-33) Add redirect support to proxy

Add redirect support to the proxy by setting the HTTPClient
created by Jetty to follow redirects. Add tests for this
functionality.
(TK-33) Add `:follow-redirects` proxy option

Add a `:follow-redirects` proxy option, which allows the user to
specify whether the HttpClient created by a ProxyServlet follows
redirects.
(TK-33) Explicitly set default follow redirects

Explicitly set the followRedirects setting on the HttpClient
created by a ProxyServlet in the default case. Cleanup redirect
tests.
(TK-33) Remove unused macro

Remove unused `with-target-and-proxy-servers-redirect` macro.
Merge pull request #56 from kbarber/maint/master/clojars-version-badge

Add a clojars version badge to the README.md
Merge pull request #61 from fpringvaldsen/TK-45-fix-proxy-schema

(TK-45) Add string support to `:scheme:` option
(TK-33) Update non-proxied path test

Update non-proxied path test to verify that the ProxyServlet
can follow a redirect from the target server to a location
not under the original proxy path.
Merge pull request #59 from fpringvaldsen/TK-33-proxy-redirect

(TK-33) Add redirect support to proxying
Update CHANGELOG for 0.7.1 release
Merge pull request #62 from cprice404/maint/master/CHANGELOG-for-0.7.1

Update CHANGELOG for 0.7.1 release
lein-release plugin: preparing 0.7.1 release
lein-release plugin: bumped version from 0.7.1 to 0.7.2-SNAPSHOT for next development cycle