Rename constant names to match regular expressions and comply a naming convention

Author: JeanDeboutGat

webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java

@@ -678,7 +678,7 @@ public Status getStatus() {
 
 
     public enum Status {
-        Init(0), Running(1), Stopped(2);
+        INIT(0), RUNNING(1), STOPPED(2);
 
         private Status(int value) {
             this.value = value;
@@ -697,7 +697,7 @@ public static Status fromValue(int value) {
                 }
             }
             //default value
-            return Init;
+            return INIT;
         }
     }