CI 3 Migration Not Running?

I am just getting started with using Migrations in CI 3 and I'm pretty sure I've followed the example to the letter. However, when I run my migration, no changes are made.

In my migration.php config I have

PHP Code:

$config['migration_enabled'] = TRUE
$config['migration_type'] = 'timestamp';
$config['migration_version'] = 20161206075650; 


My migration file is  application/migrations/20161206075650_my_first_migration.php and looks like this:

PHP Code:

<?php

defined('BASEPATH') OR exit('No direct script access allowed');

class Migration_My_first_migration extends CI_Migration {

   //upgrade
    public function up()
    {
        log_message('debug','My_first_migration UP');
    }

    //downgrade
    public function down()
    {
        log_message('debug','My_first_migration DOWN');
    }

} 


Here is my controller function to run the migrations:

PHP Code:

       public function migrate() {
        $this->load->library('migration');
        log_message('debug','Found migrations: '.print_r($this->migration->find_migrations(),true));
        if($this->migration->current() === FALSE){
            log_message('debug','Migration Error: '.error_string());
                show_error($this->migration->error_string());
            }else{
                log_message('debug','Ran Migration');
            }
        } 


For some reason, it isn't running my migration. I get this in the logs:

Code:

INFO - 2016-12-07 10:33:55 --> Migrations Class Initialized
INFO - 2016-12-07 10:33:55 --> Language file loaded: language/english/migration_lang.php
INFO - 2016-12-07 10:33:55 --> Database Forge Class Initialized
DEBUG - 2016-12-07 10:33:55 --> Found migrations: Array
(
   [20161206075650] => /path/to/project/application/migrations/20161206075650_my_first_migration.php
)

DEBUG - 2016-12-07 10:33:55 --> Ran Migration

I checked the database too and there isn't a migrations table. I assumed this would be created automatically? I checked to make sure it's using the right database.
I tried this with the latest version of CI 3 and it's still not working. 

I've looked around the forums, various blogs and Stack Overflow posts and haven't found a solution for this.

Help would be very appreciated!

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