Rename main.php to ruckus.php and add ruckusing_base to config

with this pr this is now possible :

```shell
salimane at salimane-zenbook in ~
⚛ git clone https://github.com/salimane/ruckusing-migrations.git
Cloning into 'ruckusing-migrations'...

salimane at salimane-zenbook in ~
⚛ mkdir myproject

salimane at salimane-zenbook in ~
⚛ cp ruckusing-migrations/config/database.inc.php myproject/ruckusing.conf.php

salimane at salimane-zenbook in ~
⚛ cp ruckusing-migrations/ruckus.php myproject/       

salimane at salimane-zenbook in ~
⚛ ls -la
total 1.6M
drwxr-xr-x 104 salimane  12K Jan 18 21:59 ./
drwxr-xr-x   4 root     4.0K Apr 26  2012 ../
....
drwxrwxr-x   4 salimane 4.0K Jan 18 21:50 myproject/
drwxrwxr-x   6 salimane 4.0K Jan 18 21:38 ruckusing-migrations/
....

salimane at salimane-zenbook in ~
⚛ cd myproject/

salimane at salimane-zenbook in ~
⚛ nano ruckusing.conf.php

salimane at salimane-zenbook in ~/myproject
⚛ php ruckus.php db:migrate
Started: 2013-01-18 9:50pm CST

[db:migrate]: 
	Migrating UP:


Finished: 2013-01-18 9:50pm CST

salimane at salimane-zenbook in ~/myproject
⚛ chmod +x ruckus.php 

salimane at salimane-zenbook in ~/myproject
⚛ ./ruckus.php db:migrate
Started: 2013-01-18 9:57pm CST

[db:migrate]: 
	Migrating UP:


Finished: 2013-01-18 9:57pm CST

```