Administrator username maximum length reduced to 190 to support utf8m…

…b4 charset. Fix #1

src/migrations/2014_10_12_104748_create_administrators_table.php

@@ -15,7 +15,7 @@ public function up()
 		Schema::create('administrators', function(Blueprint $table)
 		{
 			$table->increments('id');
-			$table->string('username')->unique();
+			$table->string('username', 190)->unique();
 			$table->string('password', 60);
 			$table->string('name');
 			$table->string('remember_token', 100)->nullable();