fix for issues silkimen#220 and silkimen#286

When responseType is set to json, the data should be returned as plain json string, not as a base64 encoded string.

Author: antikalk

src/android/com/silkimen/cordovahttp/CordovaHttpBase.java

@@ -193,7 +193,7 @@ protected void processResponse(HttpRequest request, CordovaHttpResponse response
     response.setHeaders(request.headers());
 
     if (request.code() >= 200 && request.code() < 300) {
-      if ("text".equals(this.responseType)) {
+      if ("text".equals(this.responseType) || "json".equals(this.responseType)) {
         String decoded = HttpBodyDecoder.decodeBody(outputStream.toByteArray(), request.charset());
         response.setBody(decoded);
       } else {

src/ios/CordovaHttpPlugin.m

@@ -62,7 +62,7 @@ - (void)setTimeout:(NSTimeInterval)timeout forManager:(AFHTTPSessionManager*)man
 }
 
 - (void)setResponseSerializer:(NSString*)responseType forManager:(AFHTTPSessionManager*)manager {
-    if ([responseType isEqualToString: @"text"]) {
+    if ([responseType isEqualToString: @"text"] || [responseType isEqualToString: @"json"]) {
         manager.responseSerializer = [TextResponseSerializer serializer];
     } else {
         manager.responseSerializer = [BinaryResponseSerializer serializer];