Replace deprecated libraries

[MBach]

Hi,

Is it possible to rewrite the code to support latest SDK? In fact, I'm having troubles with DownloadFile.java where such imports aren't recognized:

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

Also, minSdkVersion should be like version 14 and compileSdkVersion at 26.