Increase Episode#title and #slug length

[alban]

As reported in the Bonnes Ondes User forum, longer episode titles would be welcome.

They are limited to 40 for Episode#title and 30 for #slug.

[alban@…]

commit 96b960ab28342be2b47c677a1e8a569f8e5cf395
Author: Alban Peignier <alban@…>
Date: Tue Jul 27 22:25:51 2010 +0200

Increase Episode#title and #slug lengths to 50 and 40. Refs #17

[alban@…]

commit acff4dc3eee6e062cc1a86e06e6fd6fba910ee78
Author: Alban Peignier <alban@…>
Date: Tue Jul 27 22:42:59 2010 +0200

Use larger text fields for Episode#title and #slug. Refs #17

[alban@…]

commit 380a700a6814a7356b9e61ea1bd9b3a88ababdc5
Author: Alban Peignier <alban@…>
Date: Tue Jul 27 22:42:34 2010 +0200

Create the Episode#slug with supported length. Refs #17