Render Markdown natively

Stop using problematic WebView

core/src/main/java/com/topjohnwu/core/tasks/ParallelTask.java

@@ -1,26 +0,0 @@
-package com.topjohnwu.core.tasks;
-
-import android.app.Activity;
-import android.os.AsyncTask;
-
-import java.lang.ref.WeakReference;
-
-public abstract class ParallelTask<Params, Progress, Result> extends AsyncTask<Params, Progress, Result> {
-
-    private WeakReference<Activity> weakActivity;
-
-    public ParallelTask() {}
-
-    public ParallelTask(Activity context) {
-        weakActivity = new WeakReference<>(context);
-    }
-
-    protected Activity getActivity() {
-        return weakActivity.get();
-    }
-
-    @SuppressWarnings("unchecked")
-    public void exec(Params... params) {
-        executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, params);
-    }
-}