Give support to JUnit output format for sogo-tests

To integrate with CI system.

sogo-tests now accepts a flag (-f) to determine the output format:

  * text : Current behaviour and default value
  * junit: XML output suitable for CI system such as Jenkins

Tests/Unit/SOGoTest.m

@@ -154,7 +154,8 @@ static NSString *SOGoTestAssertException = @"SOGoTestAssertException";
     }
   NS_ENDHANDLER;
 
-  [testRunner incrementTestCounter: failureCode];
+  [testRunner incrementTestCounter: failureCode
+                       afterMethod: NSStringFromSelector (testMethod)];
 }
 
 - (BOOL) run