Update to SLF4J 1.7.5

James Moger

2014-04-15 a4f7cc8758e9eb2d564acdcf2f671b358aac972c

 src/main/java/com/gitblit/manager/IGitblit.java

@@ -31,6 +31,7 @@

public interface IGitblit extends IManager,
                           IRuntimeManager,
                           IPluginManager,
                           INotificationManager,
                           IUserManager,
                           IAuthenticationManager,