Add MixMonitorMute AMI Action.
To prevent Errors with file name and class name, I've renamed the ExampleCallin.java to ExampleCallIn.java (with capital "I").

This would have been the error if you do javac -cp asterisk-java.jar ExampleCallIn.java:

    ExampleCallin.java:13: class ExampleCallIn is public, should be declared in a file named ExampleCallIn.java
    public class ExampleCallIn extends BaseAgiScript {
           ^
    1 error
Merge pull request #13 from kwk/master

Java classname doesn't match filename -> compile error
Added close() hook.
Calling close() hook when closing the actual 
socket.
Closing allocated resource.
CodeStyle format
ConfigFileParserTest
ClassNameMappingStrategyTest
CompositeMappingStrategyTest
DefaultAgiServerTest
ResourceBundleMappingStrategyTest
ScriptEngineMappingStrategyTest
AbstractAgiCommandTest
ExecCommandTest
GetDataCommandTest
AgiChannelImplTest
AgiReaderImplTest
AgiReplyImplTest