Merge pull request android-async-http#663 from fineswap/JsonStreamerFix

Escape String values.

Author: Noor Dawod

library/src/main/java/com/loopj/android/http/JsonStreamerEntity.java

@@ -200,10 +200,8 @@ public void writeTo(final OutputStream out) throws IOException {
                 os.write((((Number) value).floatValue() + "").getBytes());
             } else if (value instanceof Integer) {
                 os.write((((Number) value).intValue() + "").getBytes());
-            } else if (value instanceof String) {
-                os.write(escape(value));
             } else {
-                os.write(value.toString().getBytes());
+                os.write(escape(value.toString()));
             }
 
             os.write(',');