Rxjava refactor (#2358)

* Refactor

* Refactor

rxjava/src/main/java/com/baelding/rxjava/operator/ToCleanString.java

@@ -3,9 +3,13 @@ package com.baelding.rxjava.operator;
 import rx.Observable.Operator;
 import rx.Subscriber;
 
-public class CleanString implements Operator<String, String> {
+public class ToCleanString implements Operator<String, String> {
 
-    public CleanString() {
+    public static ToCleanString toCleanString() {
+        return new ToCleanString();
+    }
+
+    private ToCleanString() {
         super();
     }
 

rxjava/src/main/java/com/baelding/rxjava/operator/ToLength.java

@@ -2,10 +2,14 @@ package com.baelding.rxjava.operator;
 
 import rx.Observable;
 import rx.Observable.Transformer;
-import rx.functions.Func1;
 
 public class ToLength implements Transformer<String, Integer> {
-    public ToLength() {
+
+    public static ToLength toLength() {
+        return new ToLength();
+    }
+
+    private ToLength() {
         super();
     }