Added comment about issue 170
Partial fix for ISSUE #170

```
  <serviceProxy name="A" port="80">...</serviceProxy>
  <serviceProxy name="B" port="80" ip="localhost">...</serviceProxy>
  <serviceProxy name="C" port="80" ip="127.0.0.1">...</serviceProxy>
```

* A vs B => no solution, only runtime exception with correct error message
* B vs C => fixed

Also added :
* check if service proxy use the same SSL configuration on the same "ip:port"
* test dependencies on Mockito and PowerMock
* junit test for HttpTransport
Moving from log4j to slf4j + logback
New feature : access to spring application context from groovy interceptor

example :
    <spring:bean name="mySpringBean" class="java.lang.String">
        <spring:constructor-arg value="Groovy interceptor"/>
    </spring:bean>

    <router>
        <serviceProxy port="2000">
            <request>
                <groovy>
                    def value = spring.getBean("mySpringBean")
                    exc.request.header.add("X-Groovy", value)
                    println "X-Groovy header added with value :" + value
                    CONTINUE
                </groovy>
            </request>
        </serviceProxy>
    </router>
Merge branch 'spring2groovy' of https://github.com/vlk32/service-proxy into private
Merge branch 'master' of https://github.com/vlk32/service-proxy into private
Merge with branch ISSUE_170
Merge with branch slf4j