Make database creation queueable (#17)

* SOLIDify database creation

* Return the result of fclose in SQLiteDBCreator

* Make database creation queueable

* Add DatabaseCreationTest

* Make comment more descriptive [ci skip]

* Add composer script to copy .env.example to .env

* Minor tweaks

* Fix env section

* Fix DB_PASSWORD for Travis

src/Jobs/QueuedDatabaseCreator.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Stancl\Tenancy\Jobs;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Stancl\Tenancy\Interfaces\DatabaseCreator;
+
+class QueuedDatabaseCreator implements ShouldQueue
+{
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+
+    /**
+     * Create a new job instance.
+     *
+     * @param DatabaseCreator $databaseCreator
+     * @param string $databaseName
+     * @return void
+     */
+    public function __construct(DatabaseCreator $databaseCreator, string $databaseName)
+    {
+        $this->databaseCreator = $databaseCreator;
+        $this->databaseName = $databaseName;
+    }
+
+    /**
+     * Execute the job.
+     *
+     * @return void
+     */
+    public function handle()
+    {
+        $this->databaseCreator->createDatabase($databaseName);
+    }
+}