Change access modifier of the Strategy interface to Public,so that us…

…ers can customize flexible Strategies

guava/src/com/google/common/base/Splitter.java

@@ -535,7 +535,7 @@ public Map<String, String> split(CharSequence sequence) {
     }
   }
 
-  private interface Strategy {
+  public interface Strategy {
     Iterator<String> iterator(Splitter splitter, CharSequence toSplit);
   }