Merge pull request android-async-http#383 from orientalsensation/RequestParams

Classes are declared private even though they're exposed as non-private.

Author: smarek

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

@@ -427,7 +427,7 @@ protected String getParamString() {
         return URLEncodedUtils.format(getParamsList(), HTTP.UTF_8);
     }
 
-    private static class FileWrapper {
+    public static class FileWrapper {
         public File file;
         public String contentType;
 
@@ -437,7 +437,7 @@ public FileWrapper(File file, String contentType) {
         }
     }
 
-    private static class StreamWrapper {
+    public static class StreamWrapper {
         public InputStream inputStream;
         public String name;
         public String contentType;