Merge branch 'MD5-rework' into 'master'

Implement MD5 cache clear routine

See merge request sheepitrenderfarm/client!249

src/main/java/com/sheepit/client/Configuration.java

@@ -293,8 +293,7 @@ import lombok.Data;
 							if (md5_local.equals(name) == false) {
 								file.delete();
 							}
-							
-							// TODO: remove old one
+							Md5.remove(file.getAbsolutePath());
 						}
 						else {
 							file.delete();