Change JmxAutoConfiguration so that by default JMX exposure is not
enabled. This matches the Javdoc text.

Change strategy from ApplicationListener to SmartLifecycle to avoid multiple registration attempts for the same beans

When running with parent/child application contexts the previous implementation was trying to re-register the same beans with JMX which led to errors.

Reinstate initializeWithSensibleDefaults() on AbstractLoggingSystem
beforeInitialize(). This is required to ensure no superfluous logging
output occurs when starting up a spring boot application from the
command line.

It appears that commit e9c649df
modified the logic in an attempt to prevent double initialization.

fixes gh-174

Actuator endpoints are now being exposed over JMX.

Filter duplicate class names when loading spring.factories files. The
prevents errors if -source jars are included on the classpath.

fixes gh-161

Spring Security 3.2 has a new annotation @EnableWebMvcSecurity that we
should use if MVC is being used.

Fixes gh-146

Now it can parse nested lists as map values.

Fixes gh-169

Fixes gh-168

Remove system properties when testing strict property binding. This
prevents test failures that can occur if the local environment happens
to have certain environment variables defined.

As discussed in gh-162