INT-2855 File Tailing Inbound Channel Adapter

Two implementations:

  - native 'tail' command (e.g. tail -F -n 0 /foo/bar)
  - Apache commons-io Tailer

Further changes:

 - Add documentation to section "what's new"
 - Add a JUnit @Rule so the OSDFTMP test doesn't fail on Windows
Merge pull request #802 from garyrussell/INT-2855

* garyrussell-INT-2855:
  INT-2855 File Tailing Inbound Channel Adapter
INT-3011 Groovy Classloader and BeanFactory Fixes

See: https://jira.springsource.org/browse/INT-3011

INT-3011 Pass BeanClassLoader and BeanFactory to GroovyScriptFactory

INT-3011 Move 'implements BeanFactoryAware, BeanClassLoaderAware'
to AbstractScriptExecutingMessageProcessor and GroovyControlBusFactory
Merge pull request #803 from srt/INT-3011

* INT-3011:
  INT-3011 Groovy Classloader and BeanFactory Fixes
INT-2855 Fix Tail Test on Build Server

 - Fix tail test
 - Fix 2 javadoc issues