create an async task for online js parsing

mobile/src/com/cradle/iitc_mobile/async/UrlContentToString.java

@@ -0,0 +1,31 @@
+package com.cradle.iitc_mobile.async;
+
+import android.os.AsyncTask;
+
+import com.cradle.iitc_mobile.IITC_Mobile;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.Scanner;
+
+/*
+ * this class parses the content of an web page.
+ * since network operations shouldn't be done on main UI thread
+ * we use an async task for this.
+ */
+public class UrlContentToString extends AsyncTask<URL, Integer, String> {
+
+    @Override
+    protected String doInBackground(URL... urls) {
+        String js = "";
+        URL url = urls[0];
+        try {
+            js = new Scanner(url.openStream(), "UTF-8").useDelimiter("\\A")
+                    .next();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return js;
+    }
+
+}